Updated June 18, 1996
________________________________________________________________________
Model 0661-467 IBM Hard Disk Drive
________________________________________________________________________
http:\\www.storage.ibm.com\storage\techsup\hddtech\hddtech.htm
FEATURES
========
- 406MB formatted capacity (520 bytes/sector)
- 400MB formatted capacity (512 bytes/sector)
- Industry-standard interface: ANSI/SCSI-2
- Thermal Compensation
- Integrated controller
- Logical block addressing
- Implied seeks
- SCSI disconnect and reconnect capability
- SCSI bus parity
- Closed-loop actuator servo
(dedicated disk servo surface plus data reference)
- Automatic actuator lock
- Dedicated head landing zone
- Average access time: 11.5 mS
- 1:1 interleave
- 1,7 run-length limited (RLL) encoding
- Media data transfer rate: 2MB/S
- SCSI data transfer rate: up to 5MB/S (synchronous)
- 128K dual-ported data buffer
- Buffer memory parity
- Self-diagnostic on power up
- Automatic retry and data correction on read errors
- In-Line alternate sector assignment
- Reassignment of new defective sectors without
the need to reformat
- Probability of not recovering data:
1 in to the power of 12 bits read
- Horizontal, back end down, left side, or right side orientation
- MTBF 43,200 hours
PERFORMANCE
===========
Data Transfer rate
Buffer to/from media 2MB/S (instantaneous)
Host to buffer up to 5MB/S (synchronous)
Host from buffer up to 5MB/S (synchronous)
Rotational speed 4316 RPM
Average latency 6.95 mS
Sector time 289.5 microS
Seek Time
Single cylinder 1.0 mS (read)
3.0 mS (write)
Typical 11.0 mS (read)
13.0 mS (write)
Average (weighted) 11.5 mS (4 reads / 1 write)
Full stroke 20.0 mS
ELECTRICAL CONNECTOR LOCATIONS
==============================
Options
Jumper SCSI Power
Block Pin 1 Pin 1
| | |
--------|----------------------------------------|------|----------
| o o o o|o o o o o o o o o o o o o o o o o o o o O | | | |
| o o o o|o o o o o o o o o o o o o o o o o o o o o | | 0 O O O |
|--------|------------------------------------------- \-----------/|
| --------- ---- --------------- --------------- ------ |
| |o o o o| | | | | | | | | |
| |o o o o| ---- | | | | | | |
| --------- | | | | ------ |
| ---------- ---- | | | | ------ |
| | | | | | | | | | ||
| | | ---- | | | | | ||
| | | | | | | ------ |
| | | ---- | | | | ------ |
| | | | | | | | | | ||
| | | ---- | | | | | ||
| ---------- --------------- --------------- ------ |
-------------------------------------------------------------------
Electrical Connectors (view from back of Disk Drive)
Jumper Settings
---------------
The jumper block shown above is used to select the
SCSI device ID, to control the spindle motor start
and to select the appropriate option pin function.
There are four ground pins, A1, A2, A3, B2. If pin B1
is jumpered to ground, drive initiated synchronous
negotiation is disabled, but requests from the
initiator will still be accepted. Option block
ground pins must only be used for selecting jumper block
functions.
Bit Option Pin Address Bit Address
0 1 2 | 0 1 2
________|____ _____________
| | | | _ |
| O O O | O----Remote = 0 | O O|O| O | = 4
| O O O O O | Start | O O|O|O O |
| | | _ |
|_____________| |_____________|
V W X Y
_____________ _____________
| _ | | _ _ |
| |O|O O O----Remote = 1 | |O|O|O| O | = 5
| |O|O O O O | Start | |O|O|O|O O |
| _ | | _ _ |
|_____________| |_____________|
_____________ _____________
| _ | | _ _ |
| O|O|O O----Remote = 2 | O|O|O| O | = 6
| O|O|O O O | Start | O|O|O|O O |
| _ | | _ _ |
|_____________| |_____________|
_____________ _____________
| _ _ | | _ _ _ |
| |O|O|O O----Remote = 3 | |O|O|O| O | = 7
| |O|O|O O O | Start | |O|O|O|O O |
| _ _ | | _ _ _ |
|_____________| |_____________|
Figure 1 Option Block
With the Remote Start jumper in place the motor
spins up when power is applied. With the Remote
Start jumper removed the motor spins up when the
drive is issued a Start Unit command.
During the power up sequence the option pin is
interrogated. If it is grounded the pin remains an
input. If it is not grounded it becomes an output,
indicating Motor Active or Command Active
depending on the state of the CMDAC bit in Mode
Select page 0.
Note: As an input the option pin has several effects
upon the SCSI function. Please refer to the 0661 SCSI
Specification for details.
MODE SELECT OPTIONS
===================
Certain "Mode Select" parameters are alterable via
the SCSI "Mode Select" command. This allows several
drive characteristics to be modified to optimize
performance on any particular system. Refer to the
0661 SCSI Specification for detailed definition of
Mode Select parameters.
Changeable parameters are:
Block Descriptor
Block length
Page 0
QPE (Qualify Post Error)
UQE (Untagged Queueing Enable)
DWD (Disable Write Disconnect)
Maximum Burst Length
ASDPE (Additional Save Data Pointer Enable)
RDDSS
CMDAC
Page 1
TB (Transfer Block)
RC (Read Continuous)
PER (Post Error)
DTE (Disable Transfer on Error)
DCR (Disable Correction)
Read Retry Count
Page 2
Read Buffer Full Ratio
Write Buffer Empty Ratio
Page 7
PER
DCR
Page 8
RCD (Read Cache Disable)
DATA ORGANIZATION
=================
Capacity
Formatted (520 bytes/sector) 406 megabytes
Formatted (512 bytes/sector) 400 megabytes
Formatted (256 bytes/sector) 200 megabytes
Cylinders
Total cylinders 1201
User cylinders 1199
Data heads 14
Disks 8
Sectors per track 48
User sectors per drive 782576
Spare sectors per drive 21152
Sector size 256 or 512 or 520
bytes/sector
DC POWER REQUIREMENTS LIMITS
============================
Power supplied to the drive must conform to the
following limits:
+12 Volt Supply
+ or -5.0% (during run)
- 7.0% +5.0% (during start)
+5 Volt Supply
+ or -5.0%
+5V DC Idle Current
Nominal Maximum
______________________________________________________
0.70 Amps 0.90 Amps
+12VDC Idle/Seek Current
The current drawn (in Amps) from the 12 Volt supply
is defined for seeking and steady state operations as
follows
Nominal Maximum
______________________________________________________
Idle
average 0.70 0.90
peak ripple 1.60
peak to peak 1.10
Seek
average 1.20 1.40
peak ripple 2.7
peak to peak 2.25
+12VDC Start/Stop Current
Nominal Maximum
______________________________________________________
start
(0-0.26 sec) 3.90 Amps 4.60 Amps
(0.26-1.5 sec) 2.90 Amps 3.30 Amps
Power Supply Ripple
Voltage Maximum Notes
______________________________________________________
+5VDC 100 mV peak-to-peak 0-10 MHz
+12VDC 150 mV peak-to-peak 0-10 MHz
Maximum Common Mode Noise
300 mV peak-to-peak (0 to 100 MHz)
Note: Common mode noise is defined as the
differential voltage between frame ground and
electrical ground.
OPERATING ENVIRONMENT
=====================
The drive operates within its' performance limits
when the following environment is maintained.
Product life calculations are based on the nominal
environment for a typical application.
Humidity:
Operating 8% to 80% noncondensing
Storage 5% to 80% noncondensing
Shipping 5% to 100% (applies at a
packaged level)
Wet Bulb Temperature:
Operating 80 Degrees F (26.7 Degrees C) maximum
Shipping/Storage 85 Degrees F (29.4 Degrees C) maximum
Elevation:
Operating -1000 to 10000 feet
(-304 to 3048 meters)
Shipping/Storage -1000 to 30000 feet
(-304 to 9144 meters)
Temperature:
Operating ambient 50 to 122 Degrees F (10 to 50 Degrees C)
Operating casting 50 to 140 Degrees F (10 to 60 Degrees C)
temperature
Operating casting Not to exceed 3.6 Degrees F (2 Degrees C)
temperature delta (see note below)
Shipping -40 to 140 Degrees F (-40 to 60 Degrees C)
Storage 34 to 140 Degrees F (1.1 to 60 Degrees C)
Note: Measured between top and bottom of disk enclosure.
ELECTRICAL INTERFACES SPECIFICATIONS
====================================
The IBM OEM 0661 Model 467 Disk Drive uses
single-ended drivers and receivers that permit cable
lengths of up to 6 meters (19.68 feet).
Connectors
----------
The drive has two connectors: one for power, the
other for connecting to the SCSI bus.
Power
-----
The DC power connector is designed to mate with
AMP part number 1-480424-0 using AMP pins part
number 350078-4 or their equivalent. Pin assignments
are shown in Figure 2.
Pin # 4 3 2 1
_______________________
| _________________ |
| / \ |
| | +5V GND GND +12V| |
| | O O O O | |
| |_________________| |
|_____________________|
Figure 2 Power Connector Pin Assignments
SCSI Signal Connector
---------------------
The SCSI signal connector is a 50-pin connector,
Molex part number 70248 or equivalent, meeting
ANSI/SCSI specifications.
SCSI Bus Terminators
--------------------
The drive has no internal SCSI bus terminators. The
user is responsible for properly terminating and
powering the SCSI bus in the system.
AMP part number 88-4163-081-1, DATA MATE
DM500-06-8, or equivalent external terminator may
be used.
For a single-ended cable, a 50-conductor flat
cable or a 25 twisted pair cable can be used, with a
maximum length of 6.0 meters and a stub length not
to exceed 0.1 meters.
The drive has an internal stub length of 0.077
meters. The SCSI bus cable must not add more than
0.023 meters additional stub length to remain
compliant with ANSI.
SCSI Bus Electrical Characteristics
-----------------------------------
Note: The drive incorporated the Western Digital
WD33C93A SCSI Interface Controller and conforms
to the ANSI/SCSI Interface standard.
ELECTROMAGNETIC COMPATIBILITY
=============================
The Drive meets the following EMC requirements
when installed in the user system and exercised with
a random accessing routine at maximum data rate:
- United States Federal Communication Commission
(RCC) Rules and Regulations, Part 15,
Subject J - Computer Devices "Class B Limits".
- European Economic Community EEC directive
#76/889 related to the control of radio frequency
interference and the Verband Deutscher Elektrotechnicker
(VDE) requirements of Germany (GOP).
START AND STOP TIMES
====================
Time Nominal Maximum
________________________________________________________________
Start 27 sec 1 min
Stop 9 sec 12.5 sec
During the start sequence diagnostics are performed
and are divided into two sections. Pre motor-start
diagnostics test the static RAM (control store
memory), post motor-start diagnostics test the data
buffer, upload the code, perform channel testing
and "Reassign in Progress" operations. For more
information on diagnostics see the 0661 SCSI
Specification.
If a Reset is issued before the drive is ready, the
power-on sequence starts again. Otherwise, when a
Reset is issued the present state of the motor is not
altered.
A timeout of one minute or more is recommended for
the Start Unit command. This allows the system
to take advantage of the extended ERP that the drive
does in order to successfully start up.
Note: It is the integrators' responsibility to ensure
that equipment into which this drive is fitted meets
the relevant regulatory requirements (EMC, etc).
COOLING
=======
This drive does require airflow in order to fulfill its'
reliability performance.
Please refer to Environmental section of the
0661-476 product specification for full details of the
maximum allowable temperatures and measurement
points.
A summary of the measurements is given on the
back page of this data sheet.
KNOWN INTEGRATION SOLUTIONS
===========================
- The drive initiates negotiation for synchronous
data transfer rate during the initialization sequence.
This may cause problems which prevent attachment to
some systems/SCSI controller cards.
Jumpering the option pin (B1) to ground on the jumper
block prevents the drive sending the synchronous
negotiation message.
However, other changes are also made to the drives
behavior ref error reporting and sense information
returned. These are detailed in the Disk Drive
SCSI specification
- NOTES -
- Attaching to NEXT Stations requires changes to
particular parameters set in the Mode Select pages.
Setting up the drive to allow attachment is as
follows:
Mode Select Page 0 byte 2 must be changed to 40
Mode Select Page 0 byte 3 must be changed to 80
- Attachment to the DEC 3100 system running
VMS 5.4.2 or later versions requires changes to
particular error recovery parameters set in the Mode
Select pages.
Setting up drive to allow attachment is as follows:
Mode Select Page 1 byte 2 must be changed to 04.
Mode Select Page 7 byte 2 must be changed to 04.
- A number of Apple systems do not appear to
accept the Unit Attention condition returned by the
drive in response to the first SCSI command issued
after power up or reset.
The 0661-467 cannot attach to these systems
although there are a number of 3rd party device
drivers which may overcome this limitation.
- To improve their performance many Apple systems
make use of a "Blind Write" feature when writing
to the data buffer on their SCSI interface card.
The 0661-467 is not compatible with this feature
and system errors can occur during "Write" operations,
particularly where large files are being transferred.
This feature must be disabled on the Apple system
to allow successful drive attachment.
Troubleshooting
===============
- The drive reports status in response to the SCSI
"Sense" command and this is a powerful trouble-
shooting tool on any drive whose failure mode still
allows it to communicate.
- If the drive is interrupted by powering down
during a format operation it will enter degraded
mode. In this mode it will return a "Unit Attention"
condition to most SCSI commands.
Issuing a "Sense" Command immediately after
issuing a "Test Unit Ready" Command will return
sense data which indicates that the drive is in
degraded mode.
The way to recover the drive is to issue the SCSI
"Format" command and allow the drive to format to
completion.
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 the dealer if you do not have an
approved shipping container.
This file was last updated on 12/14/94
