Updated June 18, 1996
________________________________________________________________________
Models DFHS-S1x, S2x & S4x IBM Hard Disk Drive
________________________________________________________________________
http:\\www.storage.ibm.com\storage\techsup\hddtech\hddtech.htm
High-perf 3.5" SCSI 1.12-4.51 GB (1993)
The superior performance characteristics of the DFHS family result from a
combination of factors. The drives spin at 7200 rpm, have industry
leading areal density, the patented PRML channel and a media data rate
of 9-12 MB/sec.
APPLICATIONS
============
- Technical/commercial workstations
- Network servers
- Mass storage arrays
- High end personal computers
FEATURES
========
- 1.12/2.25/4.51GB formatted capacity (at 512 bytes/sector).
- Industry standard interface
- 50 pin ANSI SCSI-2
- 68 pin ANSI SCSI-3
- single ended or differential (50/68 pin)
- single connector attachment (SCA 80 pin)
- 9.59/12.58 MB/s media data rate. 10 bands.
- Rotational speed 7200 rpm.
- Latency 4.17ms.
- Average read seek time 7.8ms (1.12 and 2.25GB)
8.4ms (4.51GB)
- Magneto resistive heads.
- PRML data channel (partial response maximum likelihood with
digital filter).
- Spindle Synchronization.
- User configurable block sizes.
- 512KB multi-segmented dual port data buffer.
- Drive supported SCSI bus terminator power.
- Industry standard mounting.
- Low command overhead.
- Read ahead caching.
- Write cache support.
- ECC on the fly.
- Predictive failure analysis.
- MTBF 1,000,000 hours.
BENEFITS
========
- Popular capacity points.
- Range of SCSI interfaces to suit application
- High interface data rate
- Exceptionally high data rate across entire disk surface.
- Fast access to data.
- Industry leading areal density 543MB/sq in.
- Robust data channel for improved data integrity.
- Data Server Applications.
- Compatibility with many software systems.
- Fast data retrieval in multi-tasking environments.
- Easy integration across multiple platforms.
- Easy installation.
- Improved data throughput.
- Industry leading reliability.
ELECTRICAL CONNECTOR LOCATIONS
==============================
The electrical connectors are located as shown.
.....................................................................
Electrical Connectors (rear view) 80 Pin SCA models
---------------------------------------------------
/ /
/ / / /
/ /
/ / / /
/ /
/_________________ / / ___________________/
| /__________/| |
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|________________| | | | |__________________| /
| |_________|/ | /
| __________________________ | /
| / \ | /
| / ======================== \ | /
|______/___|__________________________\_________|/
|
|
Pin 1
Note: See Electrical Interface Specifications section for
power pin assignments.
Electrical Connectors (rear view) 68 Pin models
-----------------------------------------------
/ /
/ / / /
/ /
/ / / /
/ /
/_________________ / / ___________________/
| /__________/| |
| | | | |
| | | | | | |
| | | | |
| | | | | | |
| | | | | /
| SCSI Pin 1 | | | | Aux Pin 1 | /
| | | | | | | /
|________________| | | | | |___|______________| /
| |_|_______|/ | | /
| _________________|____ _______|_ ________ | /
| \ ............... / | ....... | / \ | /
SCSI--> \ ............... / | ....... | | O O O O |<---- Power
|___\______________|_/___|_______|_|_|_______|_||/
| | |
| | |
SCSI Pin 35 Aux Pin 2 Power Pin 1
Electrical Connectors (rear view) 50 Pin models
-----------------------------------------------
/ /
/ / / /
/ /
/ / / /
/ /
/_________________ / / ___________________/
| /__________/| |
| | | | |
| | | | | | |
| | | | |
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| | | | | /
| | | | | | SCSI Pin 1 | /
| | | | | | /
|________________| | | | |___|______________| /
| |_________|/ | | /
| _______________________________|_ ________ | /
|| . . . . . . . . . . . . . . . . | / \ | /
SCSI-->| . . . . . . . . . . . . . . . . | | O O O O |<---- Power
||_________________________________|_|_______|_||/
|
|
Power Pin 1
.....................................................................
Jumper Pin Locations (front view)--all models
---------------------------------------------
.....................................................................
/ /
/ / / /
/ ___________________/
/ / / /| /
/ / | /
/ / / / | /
/____________________________/ | /
| | | |
| | | | | |
| | |______________|
| | | | /_______________|
| | | |
| | | | | | /
Option Jumper Block | | | /
Pin 1 | | | | | /
| | | |________________| /
|__|_________________________|/_________________| /
| _|________________ __ | /
|| .... ........... | |..| | /
|| ................ | -- | /
|__|_____________________|______________________|/
| |
| |
Pin 2 Termination Power Enable Pin 1
.....................................................................
<:o! WARNING: This disk drive can be damaged by Electro-Static
Discharge. Please follow recommended ESD procedures before
unpacking or handling the drive. Ask you IBM marketing
representative for details if you need assistance.
OPTION JUMPER BLOCKS
====================
DFHS models contain a jumper block that can be used to enable
certain features and select the SCSI ID of the drive. This
jumper block is referred to as the "Front" Option Jumper Block
due to it's location on the drive (opposite the SCSI connector).
This jumper block varies in pin definition based on interface
type (50, 68, Differential, SCA).
The Option Block connector (2 x 16) used on 50 pin models is an
AMP connector (PN 84156-4) having a pin spacing of 2mm.
The Option Block connector (2 x 16) used on the 68 and 80 pin
model is an AMP connector (PN 84156-5) having a pin spacing of 2mm.
.....................................................................
50/68 Pin Models
----------------
Pin
______________
Ground Pin ------------ | o 2 1 o | ----- SCSI_ID 3 (MSB, 68-pin only)
Ground Pin ------------ | o 4 3 o | ----- SCSI_ID 2 (MSB, 50-pin)
Ground Pin ------------ | o 6 5 o | ----- SCSI_ID 1
Ground Pin ------------ | o 8 7 o | ----- SCSI_ID 0 (LSB)
Unused ------------ | o 10 9 | ----- Blank (Polarity)
Ground Pin ------------ | o 12 11 o | ----- Auto Start
**Enable Active Termination | o 14 13 o | ----- +5V **
Slave Sync ------------ | o 16 15 o | ----- Master Sync
+5V ------------ | o 18 17 o | ----- External Activity LED
Ground Pin ------------ | o 20 19 o | ----- Write Protect
Ground Pin ------------ | o 22 21 o | ----- Auto Start Delay
Ground Pin ------------ | o 24 23 o | ----- Option Block Mode
Ground Pin ------------ | o 26 25 o | ----- Disable T.I. Sync Negotiation
Ground Pin ------------ | o 28 27 o | ----- Disable SCSI Parity
Ground Pin ------------ | o 30 29 o | ----- Disable Unit Attention
Ground Pin ------------ | o 32 31 o | ----- Customizing
______________
NOTE 1: If the Auto Start Shunt is not on, the file starts by SCSI
command only
NOTE 2: Models with 50 pin SCSI connectors do not have Pins 1 & 2.
NOTE 3: Pin 13 is Enable Narrow Mode on 80-pin SCA and 68-pin
differential models.
NOTE 4: Pin 14 is Ground on on 80-pin SCA and 68-pin differential
models.
Note: Pins 2, 4, 6, 8, 12, 20, 22, 24, 26, 28, 30, and 32 are Ground.
.....................................................................
SCSI ID (ADDRESS) PINS
======================
Note: In the address determination tables "off" means jumper
is not in place and "on" means jumper is in place.
Address Determination--68 and 80 Pin Models
-------------------------------------------
Bit3 Bit2 Bit1 Bit0 Address
off off off off 0
off off off on 1
off off on off 2
off off on on 3
off on off off 4
off on off on 5
off on on off 6
off on on on 7
on off off off 8
on off off on 9
on off on off 10
on off on on 11
on on off off 12
on on off on 13
on on on off 14
on on on on 15
Address Determination of 50 Pin Models
--------------------------------------
Bit2 Bit1 Bit0 Address
off off off 0
off off on 1
off on off 2
off on on 3
on off off 4
on off on 5
on on off 6
on on on 7
68 Pin Auxiliary Connector
--------------------------
The 68 pin models contain an "Auxiliary" connector that replicates
some of the functions contained in the Front Option Jumper Block.
The Auxiliary connector signal definition conforms to the SCSI
document SFF-8009 Rev 2 with the following exceptions:
1. EXTERNAL FAULT (XTFALT-) is not supported on pin 2.
2. AUTO SPIN START was chosen as the "vendor unique" signal
assignment (on pin 4). (This signal is an input to the
drive. The SCSI spec (SCSI SFF-8009) specifies this pin
as an output.) This signal should be useful for those
applications that want to "auto-start" the drive based on
location dependent SCSI ID.
This pin should be handled in one of the following ways:
a. tied to ground (auto spin start enabled)
b. allowed to "float" (no connection)
c. driven with an open collector driver (> 1 mA sink
capability)
Refer to auxiliary connector diagram below.
.....................................................................
68 Pin Auxiliary Connector Pin Assignments
------------------------------------------
Pin
______________
Unused ---------- | o 2 1 o | --------- SCSI ID 0 (LSB)
Auto Spin Start ------- | o 4 3 o | --------- SCSI ID 1
Slave Sync ---------- | o 6 5 o | --------- SCSI ID 2
External Activity LED - | o 8 7 o | --------- SCSI ID 3 (MSB)
Ground ---------- | o 10 9 | --------- Enable Active Termination
Write Protect --------- | o 12 11 o | --------- +5V
______________
.....................................................................
Auto Start (& Delay) Pins
-------------------------
The Auto Start and Auto Start Delay pins control when and how
the drive can spin up and come ready. When configured for
Auto-Startup, the motor spins up after power is applied without
the need of a SCSI Start Unit command. For no Auto-Start, a
SCSI Start Unit command is required to make the drive spin and be
ready for media access operations. When in Auto-Start mode, the
drive will delay its start time by a period of time multiplied
by its own SCSI address.
Auto-Startup Modes selectable by Auto-Start/Delay pin Combinations
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Pins (50 and 68
interface pin models) Drive Behavior
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Auto Start Auto Startup Delay (sec)
Delay Auto Start Mode? Multiplier
- - - - - - - - - - - - - - - - - - - - - - - - -
off off No NA
off on Yes 0
on off Yes 10
on on Yes 4
Pins
(80 interface pin models) Drive Behavior
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Auto Start Auto Startup Delay (sec)
Delay Auto Start Mode? Multiplier
- - - - - - - - - - - - - - - - - - - - - - - - -
off off Yes 0
off on No NA
on off Yes 10
on on No NA
External Activity (LED) Pins
----------------------------
The LED pins can be used to drive an external Light Emitting
Diode. Please refer to the LED pin section of the DFHS
Interface Specification for a detailed functional description
of this pin.
Up to 33 mA (plus or minus 5%) of TTL level LED drive
capability is provided. Current limiting for the LED is
provided on the electronics card. The LED Anode may be tied
to the +5V source provided on pin 18 of the Front Option Jumper
Block, pin 11 of the Auxiliary connector on the 68 pin Unitized
connector or the 5V power source on the 80 pin SCA model. The
LED Cathode is then connected to the EXTERNAL ACTIVITY Pin to
complete the circuit.
Note: this set of pins can be used to drive an LED located
in a bezel connected to the front end of the drive or to an
external LED in systems where the front of the drive cannot
be easily seen.
Note: 68 pin and 80 pin SCA SCSI models have two sets of pins,
a set on the front and a set on the back, that are connected to
the same LED driver circuit. The combined drive capability is
stated above.
Write Protect Pin
-----------------
If the Write Protect pin is jumpered to ground, the drive will
prohibit SCSI commands that alter the customer data area portion
of the media from being performed. The state of this pin is
monitored on a per command basis. See the DFMS interface
specification for functional details.
Option Block Mode Pin
---------------------
The Option Block Mode pin is used to modify the function of the
Front Option Jumper Block. When the Option Block Mode Pin is
not grounded the pin function of the Front Option Jumper Block will
be as defined by the upper portion of the referenced figures. When
the Option Block Mode Pin is grounded the pins (25, 27, 29, 31)
will be redefined to control what is referred to as "Alternate
Mode."
"Alternate Mode" allows tailoring of SCSI options such as "boot
up" characteristics and other operational features on a per
customer basis.
Please contact your IBM Customer Representative for functional
details on the customization of function allowed by this mode.
The state of these pins immediately after power is applied to
the drive will determine their function.
Disable T.I. Sync Negotiation Pin
---------------------------------
If a Disable Target Initiated Synchronous Negotiation pin is
grounded then an Initiator is required to start a negotiation
handshake if Synchronous and/or "Wide" (Double Byte) SCSI
transfers are desired. Please refer to the DFHS Interface
Specification for more details on this feature.
Disable SCSI Parity Pin
-----------------------
Grounding this pin will disable SCSI Parity checking.
Disable Unit Attention Pin
--------------------------
Grounding this pin will disable the drive from building Unit
Attention Sense information for commands immediately following
a Power On Reset (POR) or SCSI Bus Reset. Any pending Unit
Attention conditions will also be cleared at POR or SCSI Reset
times.
Customizing Pin
---------------
The customizing pin is currently reserved for future use.
Enable Narrow Mode
------------------
Jumpering pin 14 to pin 13 will cause the 68 pin Differential
or the 80 pin SCA to operate in a Single Byte mode. The drive
will not negotiate for "Wide" (Double Byte) operation. The
drive will terminate the unused upper byte and upper byte parity
on the SCSI Bus.
Enable Active Termination
-------------------------
Upon request, Single Ended 50 and 68 pin models are available
with on card SCSI bus Active terminators. (Please contact your
IBM Customer Representative for the appropriate card PN).
For those cards having the Active Termination feature, this
function can be enabled by installing a jumper between pins
13 and 14 of the Front Option Jumper Block or connecting pins
9 and 11 of the Auxiliary Connector on 68 SCSI pin models.
DATA ORGANIZATION
=================
Note: The recording band located nearest the disk outer
diameter (OD) is referenced to as "Notch No 1." While the
recording band located nearest the inner diameter (ID) is
called "Notch No 10." "Average" values are weighted with
respect to the number of LBAs per notch when the drive is
formatted with 512 byte blocks.
Data Transfer Rates
-------------------
Notch No 1 No 10 Average
- - - - - - - - - -
Buffer to/from media 12.58 9.59 12.07
MB/s (instantaneous)
Host to/from buffer up to 20.0 MB/s
(synchronous) (sustained)
Data buffer size (bytes) 512K
Rotational speed (RPM) 7202.7
Average latency (milliseconds) 4.17
Track density (TPI) 4352
Min Max
- - - - - - - -
Recording density (BPI) 96,567 124,970
Areal density (Megabits/sq in) 420.3 543.9
Model Numbers S4x S2x S1x
--- --- ---
Disks 8 4 2
User data heads (trk/cyl) 16 8 4
Seek times (in milliseconds)
Single Cylinder (Read) 0.6 0.6 0.6
(Write) 2.5 2.5 2.5
Average (weighted (Read) 8.4 7.8 7.8
(Write) 9.9 9.3 9.3
Full stroke (Read) 16.5 16.5 16.5
(Write) 19.0 19.0 19.0
Notes: Times are typical for a drive population under
nominal voltages and casting temperature 25 degrees C.
Weighted seeks are seeks to the cylinders of random logical
block addresses (LBAs).
Total Cylinders (tcyl) & User Cylinders (ucyl)
----------------------------------------------
All models S4x S2x S1x
---------- ---- ---- ----
tcyl ucyl ucyl ucyl
Notch No 1 1893 1879 1877 1872
Notch No 2 956 955 955 955
Notch No 3 49 48 48 48
Notch No 4 310 309 309 309
Notch No 5 349 348 348 348
Notch No 6 116 115 115 115
Notch No 7 214 213 213 213
Notch No 8 190 189 189 189
Notch No 9 131 130 130 130
Notch No 10 208 206 206 206
Sum of all Notches 4416 4392 4390 4385
Spare Sectors/cylinder
----------------------
S4x S2x S1x
--- --- ---
Notch No 1 40 20 10
Notch No 2 40 20 10
Notch No 3 38 19 10
Notch No 4 37 19 9
Notch No 5 36 18 9
Notch No 6 34 17 9
Notch No 7 33 17 8
Notch No 8 32 16 8
Notch No 9 31 16 8
Notch No 10 30 15 7
Last cylinder
extra spares 60 30 14
User bytes/sector
-----------------
256-744 (even number of bytes only)
Sectors/logical block
---------------------
1-8
The lowest sectors/lba that satisfies the following rules is used:
1. Block Length is evenly divisible by a number 2-8.
2. Quotient of previous equation is evenly divisible by 2.
3. Quotient must be greater than or equal to 256 and
less than or equal to 744.
User bytes/logical block
------------------------
145-5952
Gross sectors per track for several block lengths
-------------------------------------------------
Notch Number
User bytes/ 1 2 3 4 5 6 7 8 9 10
logical block
256 216 216 216 202 195 180 180 180 180 162
512 135 135 130 126 120 115 112 108 105 100
520 128 128 128 123 115 112 108 105 102 99
522 128 128 128 122 115 112 108 105 102 90
524 128 128 128 120 115 112 108 105 102 90
528 128 128 126 120 112 112 108 105 101 90
688 102 102 102 98 90 90 90 90 81 78
744 96 96 96 90 90 90 81 78 77 73
User capacity for several block lengths
---------------------------------------
S1x Models
User bytes/ formatted capacity logical blocks/
logical block (bytes) drive
256 912,135,680 3,563,030
512 1,126,337,536 2,199,878
520 1,092,119,600 2,100,230
522 1,091,803,716 2,091,578
524 1,094,691,544 2,089,106
528 1,100,365,728 2,084,026
688 1,149,310,880 1,670,510
744 1,167,099,408 1,568,682
S2x Models
User bytes/ formatted capacity logical blocks/
logical block (bytes) drive
256 1,826,312,448 7,134,033
512 2,255,098,368 4,404,489
520 2,186,554,760 4,204,913
522 2,185,931,898 4,187,609
524 2,191,716,460 4,182,665
528 2,203,082,640 4,172,505
688 2,300,969,904 3,344,433
744 2,336,559,528 3,140,537
S4x Models
User bytes/ formatted capacity logical blocks/
logical block (bytes) drive
256 3,654,540,800 14,275,550
512 4,512,701,440 8,813,870
520 4,375,536,880 8,414,494
522 4,374,300,492 8,379,886
524 4,385,878,952 8,369,998
528 4,408,629,984 8,349,678
688 4,604,578,976 6,692,702
744 4,675,830,192 6,284,718
MODE SELECT OPTIONS
===================
Certain parameters are alterable using the SCSI "Mode Select"
command. This allows certain drive characteristics to be
modified to optimize performance on a particular system. Refer
to the DFHS SCSI Functional Specification for a detailed
definition of Mode Select parameters.
DC POWER REQUIREMENT LIMITS
===========================
The following voltage specifications apply at the drive power
connector. There are no special power on/off sequencing
requirements.
+12 Volt Supply
+/- 5.0% (during run)
+5.0% / -7.0% (during spin-up)
+5 Volt Supply
+/- 5.0% (during run and spin-up)
S1x and S2x Power Supply Current +5VDC
--------------------------------------
Population
Notes Mean
Idle average .690 Amps (note 1)
R/W average .98 Amps
R/W pulse Base-to-peak .28 Amps
S4x Power Supply Current +5VDC
------------------------------
Idle average .720 Amps
R/W average 1.01 Amps
R/W pulse Base-to-peak .33 Amps
S1x Power Supply Current +12VDC
-------------------------------
Idle average .3 Amps
Seek average 1 op/sec .0027 amps
Seek peak 1.2 Amps (note 2)
Spin-up 1.5 sec max 1.5 Amps (note 3)
S2x Power Supply Current +12VDC
-------------------------------
Idle average 0.43 Amps
Seek average 1 op/sec 0.003 Amps
Seek peak 1.2 Amps (note 2)
Spin-up 1.5 sec max 2.7 Amps (note 3)
S4x Power Supply Current +12VDC
-------------------------------
Idle average 0.84 Amps
Seek average 1 op/sec 0.004 Amps
Seek peak 1.2 Amps (note 2)
Spin-up 1.5 sec max 2.7 Amps (note 3)
Notes on typical current draws:
1. 5 Volt current is given with termination power provided
by the using system.
2. The idle average and seek peak should be added together
to determine the total 12 volt peak current.
3. The current at start is the total 12 volt current
required (ie, the motor start current, module current and
voice coil retract current).
Externally generated ripple
---------------------------
(as seen at drive power connector)
Voltage Maximum Notes
- - - - - - - - - - - - - - - -
+5VDC 150mV peak-to-peak 0-20MHz
+12VDC 150mV peak-to-peak 0-20MHz
During drive start up and seeking, 12 volt ripple is generated
by the drive (referred to as dynamic loading). If several drives
have their power daisy chained together then the power supply
ripple plus other drive's dynamic loading must remain within
the regulation tolerance window of =/- 5%. A common drive
supply with separate power leads to each drive is a more
desirable method of power distribution.
MODELS
======
The DFHS disk drive is available in the following capacities:
DFHS-31080 1.0GB
DFHS-32160 2.0GB
DFHS-34320 4.0GB
The DFHS capacities vary as a function of model and user block
size. The emerging Industry Standard Capacity points are
multiples of 1.08GB (ie, 1.08/2.16/4.32) at a block size of
512 bytes. This and future products will plan to provide
capacities that are consistent with this standard.
Users who choose to make full use of the DFHS drive capacity
above the standard capacity points may not find equivalent
capacity breakpoints in future products.
Capacity GB SCSI Pins/ SCSI Electrical
Model No. (at 512 Byte) Connector Type Signal Type
--------- ------------- -------------- ---------------
S1F 1.12 50/"A" SEF
S1W 1.12 68/"Unitized" SEF/W
S1E 1.12 68/"Unitized" DF/W
S1S 1.12 80 SCA SEF/W
S2F 2.25 50/"A" SEF
S2W 2.25 68/"Unitized" SEF/W
S2E 2.25 68/"Unitized" DF/W
S2S 2.25 80 SCA SEF/W
S4F 4.51 50/"A" SEF
S4W 4.51 68/"Unitized" SEF/W
S4E 4.51 68/"Unitized" DF/W
S4S 4.51 80 SCA SEF/W
Note:
"SEF" stands for Single Ended Fast
"SEF/W" stands for Single Ended Fast/Wide
"DF/W" stands for Differential Fast/Wide
Notes:
- 50 pin SCSI connector models offer an 8 bit SCSI bus using
the SCSI "A" connector.
- 68 pin SCSI connector offers an 8/16 bit SCSI bus using the
SCSI "P" connector which supports Wide data transfers.
- 80 pin SCSI connector models offer an 8/16 bit SCSI bus
using the SCA connector.
- All models support Fast SCSI data transfers.
OPERATING ENVIRONMENT
=====================
The drive operates with its performance limits when the
following environment is maintained. Product life calculations
are based on the nominal environment for a typical application.
Humidity:
---------
Operating 5% to 90% noncondensing
Storage 5% to 95% noncondensing
Shipping 5% to 100%
(applies at a packaged level)
Wet Bulb Temperature:
---------------------
Operating & Storage 80 degrees F (26.7 degrees C) maximum
Shipping 85 degrees F (29.4 degrees C) maximum
Elevation:
----------
Operating -1000 to 10,000 feet
(-304 to 3048 meters)
Shipping/Storage -1000 to 40,000 feet
(-304 to 12,192 meters)
Temperature:
------------
Operating ambient 41 to 131 degrees F (5 to 55 degrees C)
Operating casting 41 to 158 degrees F (5 to 60 degrees C)
temperature
Shipping -40 to 149 degrees F (-40 to 65 degrees C)
Storage 34 to 149 degrees F (1.1 to 65 degrees C)
Temperature Gradient:
---------------------
Operating 36 degrees F (20 degrees C) per hour
Shipping/Storage Below condensation
These temperature limits are extremely important and must not
be exceeded at the worst case drive and system operating conditions
with the drive randomly seeking, reading, and writing.
HOT PLUG/UNPLUG SUPPORT
=======================
Power supply and SCSI bus hot plug and unplug is allowed. There
is no special sequence required for connecting 5 volt, 12 volt,
or ground. During a hot plug-in event the drive being plugged
will draw a large amount of current at the instant of plug-in.
This current spike is due to charging the bypass capacitors
on the drive. This current pulse may cause the power supply to
go out of regulation. If this supply is shared by other drives
then a low voltage power on reset may be initiated on those
drives. Therefore the recommendation for hot plugging is to
have one supply for each drive. Never daisy chain the power
leads if hot plugging is planned. Hot plugging should be
minimized to prevent wear on the power connector.
Hot plugging the SCSI bus may cause glitches on the bus. To
minimize the chance of glitching, it is recommended to plug
in the SCSI bus before the power is applied.
During hot plugging, the supplies must not go over the upper
voltage limit. This means that proper ESD protection must be
used during the plugging event.
ELECTRICAL INTERFACE SPECIFICATIONS
===================================
Power Connector
---------------
The DC power connector used on all models (50, 68, and 80 pin
SCA) are an integral portion of the 50/68 pin SCSI "Unitized"
Connectors or the 80 pin "Single Connector Attachment" (SCA)
Connector.
.....................................................................
Power connector pin assignments
- - - - - - - - - - - - - - - -
Pin 4 3 2 1
__________________________
| ____________________ |
| / \ |
| | O O O O | |
| |____________________| |
|________________________|
+5V GND GND +12V
.....................................................................
SCSI Bus Connector
------------------
DFHS has different model types that support 50 or 68 pin SCSI
connectors in either single-ended or differential driver/receiver
configurations. Also supported is the 80 pin SCA in a single-ended
driver/receiver configuration.
50 Pin Signal Connector
-----------------------
50 pin models use an AMP PN 84160-1 connector. The connector is
compatible with the ANSI SCSI "A" connector specifications. It
is limited to 8 bit data transfers only.
68 Pin Signal Connector
-----------------------
58 pin models use an AMP connector (PN 786963-1) that is
compatible with the ANSI SCSI "P" connector specifications.
It can transfer data in both 8 bit (narrow) and 16 bit (wide)
modes.
Note: That the "P" connector is not mechanically compatible with
the 50-pin "A" connector as defined in the ANSI SCSI-2 standard.
Therefore system cables used with 50 pin products cannot be
plugged directly into 68 pin models. Despite the difference in
connector, the differential 68 pin models are electrically
compatible with differential 50 pin models and other 50 pin
differential SCSI products and therefore can coexist on the
same bus. In order to do so, the differences in connector
types would need to be accounted for in the cable. The same can
be said for connecting 68 and 50 pin single-ended models to the
same bus. Differential and single-ended models do not work
connected to the same bus.
80 Pin (Single Connector Attachment) Connector
----------------------------------------------
80 pin SCA models use a Molex connector (PN 87091-0001) that is
compatible with the specification of: "Single Connector Attachment
for Small SCSI Disk Drives." It can transfer data in both
8 bit (Narrow) and 16 bit (wide) modes.
Note: That the "SCA" connector is not mechanically compatible
with the 50 pin "A" connector or the 68 pin "P" connector as
defined in the ANSI SCSI standard. This connector is intended
for direct backplane attachment and is not intended to be cable
attached to the bus.
SCSI Bus Cable
--------------
Single-ended models permit cable lengths of up to 6 meters
(19.68 feet). It should be noted however that users who plan
to use "Fast" data transfers with single-ended models should
follow all of the ANSI SCSI guidelines for single-ended "Fast"
operations. This may include a cable length of less than
6 meters.
SCA connector models are not designed for direct cable attachment
due to the combination of power and SCSI bus signals. "Fast"
data transfers with SCA models should follow all of the ANSI
SCSI guidelines for single-ended "Fast" operations.
Differential models permit cable lengths of up to 25 meters
(82.02 feet). Cables must meet the requirements for
differential cables as set forth in the ANSI SCSI-2 standard
under "Cable Requirements--Differential Cable."
The ANSI SCSI standard states that any stub from main cable
must not exceed 0.1 meters for single-ended cables and 0.2
meters for differential cables. <O| DFHS |O> has a maximum internal
stub length of 0.05 meters on all "single-ended" SCSI signals,
and 0.1 meters on all "differential" SCSI signals. To remain
compliant with the standard, the SCSI bus cable must not add
more than 0.05 meters additional stub length to any of the
single-ended SCSI signals or 0.1 meters to any differential
SCSI signals.
SCSI BUS TERMINATORS (OPTIONAL)
===============================
For those cards having the Active Termination feature, this
function can be enabled by installing a jumper between between
pins 13 and 14 of the Front Option Jumper Block or connecting
pins 9 and 11 of the Auxiliary Connector on 68 SCSI pin models.
The using system is responsible for making sure that all
required signals are terminated at both ends of the cable.
80 pin SCA models do not have internal SCSI bus terminators.
Some external terminator possibilities for single-ended cabled
systems are listed below:
Single-ended SCSI Terminators
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
50 Pin Model Terminators 68 Pin Model Terminators
- - - - - - - - - - - - - - - - - -
DM550-06-0 DM5000 68689
DM1050-02-0 DM2050-02-685
Differential models do not have internal SCSI bus terminators.
Some terminator possibilities are shown below:
Differential SCSI Terminators
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
50 Pin Model Terminators 68 Pin Model Terminators
- - - - - - - - - - - - - - - - - -
Data Mate DM550-05-0 Data Mate DM2050-01-68D
Data Mate DM1050-06-0 DM5000 686810
Note: A Meritec model 940900-4 or a DataMate DM5000-5068-11
can be used to connect the 68 pin connector on a SxW drive for
use with a 50 pin connector. The drive will now perform 8 bit
transfers.
SCSI Bus Termination Power
--------------------------
Termination power is optionally provided for systems that
desire to use it. In order to use the termination power, the
user needs to install a jumper between pins 1 and 2 of the
TermPower Block. The jumper should only be installed on one
device, which should be the last device on the SCSI bus (ie,
the drive that is physically closest to a terminator). 68 pin
models can source up to 2.0 Amps of current at 5.0 Volts
(plus/minus 5%) for termination power. 50 pin models can
source up to 1.5 Amps of current at 5.0 Volts (plus/minus 5%)
for termination power.
SCSI Bus Termination Power Short Circuit Protection
---------------------------------------------------
The ANSI SCSI-2 specification recommends for devices that
optionally supply TERMPWR, to include current limited protection
for accidental short circuits. It also recommends that the
maximum current available for TERMPWR should not exceed 5 Amps,
UL has a different requirement that they call 8 Amp rule. This
rule states that when a power source leaves an enclosure (like
SCSI TERMPWR in the SCSI cable), it must trip 8 Amps of current
within 1 minute.
The drive limits current to 5.0 amps through the use of a
permanent fuse mounted on the electronics card. Systems may
also provide short circuit protection for drive supplied TERMPWR
by limiting the current of the 5v power it supplies to the drive.
SCSI BUS NOISE REDUCTION RECOMMENDATIONS
========================================
The SCSI committee has spent a large amount of resource
looking into what needs to be done to assure SCSI devices will
work as specified in the SCSI-2 standard. As a result of this,
the committee is recommending the following approach.
- Use regulated 110 ohm terminator
- Use AWG 28 polyoelfin shielded cables
- Make sure data and parity are on the outer ring of the cable
and that REQ and ACK are in the core of the cable.
START AND STOP TIMES
====================
Time | Nominal | Maximum
-----------|---------------------|------------------
Models | S1x S2x S4x | S1x S2x S4x
| |
Power Up | 1.5 1.5 1.5 | 2.0 2.0 2.0
Start-up | 12.4 17.6 16.5 | 1 min 1 min 1min
Spin-up | 8.2 13.2 11.7 | 30.8 30.8 32.1
Stop Time | 6.0 9.0 8.0 | 12.0 12.0 12.0
Note: Seconds unless stated.
Note: BATS is the abbreviation for Basic Assurance Tests.
Start-up sequence spins up the spindle motor, uploads code,
performs BATS2 (verifies read/write hardware), resumes
"Reassign in Progress" operations, and more. For more
information on the start-up sequence, refer to the <O| DFHS |O>
Interface Specification.
.....................................................................
Bring-up Sequence
-----------------
Power-up Start-up Sequence
|<---------->|<--------------------------------------------------->|
| Reset, Init| Spin-up Upload BATS2 Reassign, etc. |
| and Test of|<----------->|<-------->|<-------->|<--------------->|
| Controller | | | | |
| | | | | |
| | Motor Start | | Testing | |
| Enable | | | of | |
| SCSI Bus | Init Servo | |Read/write| |
|____________|_____________|__________|__________|_________________|
| | |
| | |
Power-on Auto Start function File ready to accept
enabled or Start Unit Read and Write
command issued at this commands.
time.
Note: If a RESET is issued before the drive comes ready the
power on sequence will start again. In all other cases when
a RESET is issued the present state of the motor is not altered.
.....................................................................
VIBRATION AND SHOCK
===================
Operating/Nonoperating Vibration
--------------------------------
Due to the complexity of this subject we recommend that users
contact the Distributor to discuss how to perform the required
measurements if they believe this to be an area which requires
evaluation.
Operating Shock
---------------
The drive will continue to operate, at the stated "Performance"
when subjected to a 5G half sine wave shock pulse of 11 milliseconds
duration.
No permanent damage will occur to the drive when subjected to
a 10G half sine wave shock pulse of 11 milliseconds duration.
The shock pulses are applied in either direction in each of
three mutually perpendicular axes, one axis at a time.
Nonoperating Shock
------------------
No damage will occur if the unpackaged drive is not subjected
to a square wave shock greater than a "faired" value of 35 Gs
applied for a period of 20 milliseconds, in one direction at
a time.
Additionally, no damage will occur if the unpackaged drive is
subjected to an 11 millisecond half-sine wave shock of not greater
than 60 Gs applied to all three axes, one axis at a time.
MECHANICAL SPECIFICATIONS
=========================
This section details the mechanical specifications of the
IBM OEM DFHS disk drive. (All versions)
Weight
------
S1x, S2x models
Approximately 1.0 pounds (0.46 kilograms)
S4x model
Approximately 1.8 pounds (0.82 kilograms)
Dimensions
----------
| U.S. | S.I. Metric
-----------|------------------------|----------------------
Height | 1.00 in (S4x 1.63 in) | 25.4mm (S4x 41.3mm)
Width | 4.00 in | 101.6mm
Depth | 5.75 in | 146.0mm
Clearances
----------
A minimum of 2mm clearance should be given to the bottom surface
except for a 10mm diameter area around the bottom mounting
holes. The diagram shows the 2mm clearance requirements
(see 1). For proper cooling it is suggested that a clearance
of 6mm be provided under the drive and on top of the file.
Note: The top of the drive will not exceed the height
dimension by more than 2 millimeters during a nonoperating
shock.
Mounting
--------
The drive can be mounted with any surface facing down.
The drive has both side and bottom mounting holes. Refer
to diagrams below for the location of these mounting holes for
each configuration.
The maximum allowable penetration of the mounting screws is 3.8mm.
The torque applied to the mounting screws must be 0.8 Newton
meters plus/minus 0.1 Newton meters.
.....................................................................
Location of mounting holes
--------------------------
SIDE VIEW
=========
REAR Bezel
v
SCSI --------------------------------------- - - - - - - -
and | | | :
Power | (6x)6-32 UNC-2B | | :
Connectors | | | G F
-----------> ---| | | : :
: | | - O - - - - O - - - - - - O - - | - | - - - :
- - - -:---------:---------:-------------:---------: - - - - - - -
- - - -:- - - - -:- - - - -:- - - - - - -:- - -:- -: :
: : : :- - - A - - -:- B -:-C-:
: : :- - - - - - - - D - - -: :
H :- - - - - - - - - - - - - E - - - - - -:
A = 60.00 +/- 0.2 mm front mount hole to center mount hole
B = 16.00 +/- 0.4 mm DE front to front mount hole CL
C = 4.83 mm bezel thickness
D = 101.60 +/- 0.2 mm front mount hole to rear mount hole
E = 146.00 +/- 0.5 mm DE + connector length
F = 25.20 +/- 0.5 mm DE height (1" models)
41.40 +/- 0.5 mm DE height (1.6" models)
G = 6.35 +/- 0.5 mm mount hole CL above bottom DE surface
H = 2.00 mm minimum required clearance under DE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BOTTOM VIEW
=========== Bezel
v
--- - - - - - -
- - - ---------------------------------------| | :
Power : | | - O - - - - O - - - - - - - - | - | - - - - :
Connector : | | | | : :
: |---| | | : :
REAR : | | | | : :
A |---| | | F :
: | | ---(4x)6-32 UNC-2B | | : D
SCSI : | | | | | E : :
Connector : | | v | | : : :
: | | - O - - - - O - - - - - - - - | - | - - - - :
- - - -----------:---------:-----------------| - | - - :
: : --- -:- - - - -
:- - B - -:- - - - C - - - -: :
: :
-:-G-:-
A = 101.60 +/- 0.5 mm DE width
B = 44.45 +/- 0.2 mm distance between mount hole CLs
C = 60.33 +/- 0.4 mm DE front to front mount hole CL
D = 104.14 +/- 0.3 mm bezel width
E = 3.18 +/- 0.3 mm DE side to mount hole CL
F = 95.24 +/- 0.2 mm distance between mount hole CLs
G = 4.83 mm bezel thickness
.....................................................................
Grounding Requirements of the disk enclosure
--------------------------------------------
The disk enclosure is at Power Supply ground potential. It is
allowable for the user mounting scheme to common the Disk
Enclosure to Frame Ground potential or to leave it isolated
from Frame Ground.
The drive's mounting frame must be within plus/minus 150 millivolts
of the drive's power supply ground. At no time should more than
35 milliamps of current (0 to 100MHz) be injected into the disk
enclosure.
TEMPERATURE MEASUREMENTS
========================
The following is a list of measurement points and their
temperatures (maximum and reliability). Maximum temperatures
must not be exceeded at the worst case drive and system
operating conditions with the drive randomly seeking, reading,
and writing. Reliability temperatures must not be exceeded
at the nominal drive and system operating conditions with the
drive randomly seeking, reading, and writing.
Maximum Reliability
- - - - - - - - - - - - - -
Disk Enclosure Top 158 F (70 C) 131 F (55 C)
Disk Enclosure Bottom 158 F (70 C) 131 F (55 C)
PRDF Module 203 F (95 C) 176 F (80 C)
WD COMBO Module 185 F (86 C) 167 F (75 C)
Microprocessor Module 194 F (90 C) 167 F (75 C)
VCM FET 194 F (90 C) 167 F (75 C)
SMP FET 194 F (90 C) 167 F (75 C)
...........................................................................
Top view
--------
---------------------------------------
| | |
| | |
| \____________|
REAR | |
(SCSI/power) | (DE Top) - - - - - - | - - - -
| : | :
| : | 41.86 mm
| : | :
| : | :
----------------------:---------------- - - - -
: :
: :
:- - 58.53 mm - -:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bottom view
-----------
:- - - - 89.17 mm - - - -:
: :
-------------:------------------------- - - - -
| O :FETS O | :
| : | 38.5 mm
| : | :
REAR | (DE Bottom) - - - - - - - - - | - - - -
(SCSI/power) | |
| |
| WD Micro |
| Combo PRDF |
| O O |
---------------------------------------
Note: The diagrams above define where measurements should be
made to determine the top casting temperature during drive
operation and shows the location of the PRDF module. The
diagrams above define the modules that are located on the
bottom side of the card and the measurement location on the
bottom of the casting.
There must be sufficient air flow through the drive so that the
casting and module temperature limits defined above are not
exceeded.
..........................................................................
Module Temperature Measurement Notes
------------------------------------
1. Center on the top surface of the module.
2. If copper tape is used to attach temperature sensors, it
should be no larger than 6mm square.
SPINDLE SYNCHRONIZATION
=======================
Spindle Synchronization Overview
--------------------------------
There are four modes of spindle synchronization. See below
for a list of how the -MASTER SYNC and -SLAVE SYNC pins on the
Option Jumper Block are used for the different modes. The
following paragraphs give a short description of each spindle
synchronization mode:
- The Slave drive (Slave Sync mode) receives the index from
the Master drive on the -SLAVE SYNC line and synchronizes its
INDEX (Slave index) to it.
- Should the drive be the Master drive (Master Sync mode),
it outputs its INDEX on the -MASTER SYNC and -SLAVE SYNC lines.
The Master drive does not synchronize its Index to any other
device. It simply outputs its INDEX.
- In the Master Sync Control mode, a drive will synchronize its
spindle to the signal it receives on the -SLAVE SYNC input. It
outputs to -MASTER SYNC a pulse that has the same period as the
drive INDEX, but is not synchronized to the drive INDEX
generated from the disk.
- In the nonsync mode, the drive will receive the -SLAVE SYNC
signal, but it is not used by the drive.
SPINDLE SYNCHRONIZATION CONTROL LINES
=====================================
Spindle Synchronization Functional Modes
----------------------------------------
--------------------------------------------------------------
| -MASTER SYNC | -SLAVE SYNC | Functional Mode |
|----------------|------------------|------------------------|
| released | receive | Slave sync |
| drive | drive | Master sync |
| drive | receive | Master sync control |
| released | receive | non sync |
--------------------------------------------------------------
Drive Synchronization with Offset
---------------------------------
The drive electronics receives the Master Index and creates the
delayed Slave Index from the drive INDEX. The delay is determined
by using the SCSI Mode Select command, Rigid Disk Drive Geometry
Parameters. A rotational offset of 0/256 of a revolution up
to 255/256 of a revolution may be selected in increments 1/256
of a revolution. Reference the <O| DFHS |O> Interface Specification for
further information on the rotational offset of synchronized
spindles.
......................................................................
-SLAVE SYNC
_____ ________________________ ... _____ _______________
\___/ \___/
: : :
-->: :<-- 2.0 usec, minimum :
: :
:<------- 8.333 msec -------- ... ----->:
:
:
-->: :<-- +/- 20.0 usec
:___ ___
_________/ \________________________ ... _____/ \____________
+SLAVE INDEX (internal signal)
......................................................................
Synchronized Time
-----------------
The SCSI Mode Select command is used to select the Spindle Sync
mode. It could take up to 3.0 seconds (1.5 sec nominally) to
synchronize the Slave drive to the Master drive. While the Slave
drive is synchronizing to the Master, it will not be able to read
and write data. Once synchronized, the drive will maintain
plus/minus 20 usec synchronization tolerance.
Spindle Synchronization Bus
---------------------------
The spindle synchronization Bus consists of the two signal lines,
-MASTER SYNC and -SLAVE SYNC. One potential configuration of
this bus for drives that are to be used in a synchronized mode is
shown in the following figure. This example required the -SLAVE
SYNC lines to be daisy chained together.
......................................................................
---------- ---------- ---------- ----------
| Master | | Slave | | Slave | | Slave |
| Drive | | Drive | | Drive | ... | Drive |
| | | | | | | |
---------- ---------- ---------- ----------
| | <-Option Block--> | | | | | |
----- ----- ----- -----
o o o o
| | | |
| | | |
| | | |
----------------------------------------- ... -------
-SLAVE SYNC
......................................................................
Termination
-----------
Bus termination of the -MASTER SYNC and -SLAVE SYNC signals is
internal to the drive. These two signals each have a 2000 ohm
pullup to the +5 volt supply. A maximum of 16 drives can have
their -MASTER SYNC or -SLAVE SYNC lines daisy chained together.
Violating this could damage the Master drive line driver on the
-MASTER SYNC and/or -SLAVE SYNC line.
It is the using system's responsibility to provide the cable to
connect to the -SLAVE SYNC lines, and the -MASTER SYNC lines
where needed, of the synchronized drives.
Bus Characteristics
-------------------
- maximum Bus length is 6 meters
- 2 micro-second negative active pulse (when sourced to drive)
- minimum of 1 micro-second negative active pulse when
externally sourced
- 0.8 volts = valid low input
- 2.2 volts = valid high input
- 0.4 volts = low output
- Vcc volts = high output
- 60 milli-amps = maximum output low level sink current
-
The driver used for these two signal lines is a tri-state buffer.
-SLAVE SYNC Input Timing Requirements
-------------------------------------
If the input to -SLAVE SYNC is supplied by an external source
other than a <O| DFHS |O> drive, the period of the input signal
must be 8.333 msec with a tolerance of +/- .025%.
PACKAGING: The drive must be protected against Electro-Static
Discharge especially when being handled. The safest way to
avoid damage is to put the drive in an anti-static bag before
ESD wrist straps etc are removed.
Drives should only be shipped in approved containers, severe
damage can be caused to the drive if the packaging does not
adequately protect against the shock levels induced when a box
is dropped. Consult your IBM marketing representative if you
do not have an approved shipping container.
