Model DCHS-34450 IBM Hard Disk Drive
_____________________________________________________________________
Update June 6, l996
IBM has introduced a range of disk drives intended for advanced
storage applications which demand fast access to large amounts of
data. The drives spin at 7200 RPM, has an EPRML channel embedded
sector servo and S.M.A.R.T.
Product description
-------------------
Models
SCSI 2 Fast (50 pin single-ended)
SCSI 2 Fast (68 pin single-ended and differential)
SCSI 3 Fast 20 (68 pin single-ended and differential)
SCSI 3 Fast 20 (80 pin single-ended SCA-2)
Applications
Technical/commercial workstations
Network servers
Mass storage arrays
High end personal computers
Large scale imaging and graphics
Video servers
Video editing
Features
* 4550 and 9111 MB formatted capacity
(512 byte/sector)
* Industry standard interface
-50 pin ANSI SCSI-2
-68 pin ANSI SCSI-2
-68 pin ANSI SCSI-3
-80 pin ANSI SCSI-3
* 10.3/16.4 MB/s media data rate
* Rotational speed 7200 rpm
* Average seek time 7.5 ms (4.55 GB)
8.5 ms (9.10 GB)
* Latency 4.17 ms
* 512 KB multi-segmented dual port data buffer
* Spindle synchronization
* Low command overhead * Read ahead caching
* ECC on the fly (EOF)
* Industry standard mounting
* Predictive failure analysis (S.M.A.R.T. compliant)
Electrical interface specifications
-----------------------------------
Connectors
The electrical connectors are located as shown.
┌──────────────────┬──────┬──┐═══════════┐
│ │ │ │ │
│ │ │ │ ┌──┤
│ │ │ ├────────┤ │
│ │ │ │ ┌─────┤ │
│┌┬┬═════════════════════════════════─┬┬┐│
││││::::::::::::::::::::::::::::::::::││││
└┴┘└┼─────────────────────────────────┘└┴┘
│
└─Pin 1
Electrical connectors (rear view) 80 pin SCA models
Aux. Connector Pin 1─┐ Power Pin 1
SCSI Pin 1────┐ │ │
┌════════════════┬──┼──╔════│════════│═══┐
│ │ │ │ ║ │ │ ││
│ │ │ │ ║ │ │ ││
│┌────────────┼─┬┴──┼──╨────┼────────┼──┤│
││┌───────────┴─┴───┼┐┌─────┼┐╔══════│╗ ││
│││::::::::::::::::::││::::::│║o o o o║ ││
││└─────────────────┼┘└─────┼┘╚═══════╝ ││
└┴──────────────────┼───────┼───────────┴┘
│ Pin 2
Pin 35
Electrical Connectors (rear view) 68 pin models
Pin 1 Pin 1
│ │
│ │
┌════════════════┬─────╔═══│═════════│═══┐
│ │ │ ║ │ │ ││
│ │ │ ║ │ │ ││
│┌────────────┼─┬┴─────────┼─────────┼──┤│
││┌───────────┴─┴──────────┼┐ ╔══════│╗ ││
│││::::::::::::.::::::::::::│ ║o o o o║ ││
││└────────────────────────┼┘ ╚═══════╝ ││
└┴─────────────────────────┼────────────┴┘
SCSI I/F │
Connector │
│
Electrical connectors (rear view) 50 pin models
┌──────────────────┬──────┬──┐═══════════┐
│ │ │ │ │
│ │ │ │ ┌──┤
│ │ │ ├────────┤ │
│ │ │ │ ┌─────┤ │
│┌┬─════════════════════════════════════┐│
│││ :::.::::::::::: ││ ││
└┴┴───────────────═══════════───────────┴┘
││ (15x)2mm ││ 2.54 mm
--->││<--- --->││<--------
Jumper pin locations (front view) all models
Note: No termination power on 80 pin SCA
The DC power connector is designed to mate with AMP part 1-48024
(using AMP pins P/N 350078-4). Equivalent connectors may be used.
Pin assignments are shown below, as viewed from the end of the drive.
Pin # 4 3 2 1
╔═══════╗ Pin # 1 - +12V
║O O O O║ 2,3 - GND
╚═══════╝ 4 - +5V
Hot plug/unplug support
-----------------------
The drives do support hot plug/unplug (excepting the 80 pin SCA).
Refer to the Ultrastar 2XP hardware/functional specification for
more details.
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
limits. This means that proper ESD protection must be used during the
plugging event.
50 pin SCSI 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 SCSI signal connector
68 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. Both single-
ended and differential versions are supported. 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.
Connecting 68 and 50 pin single-ended models to the same bus can also
coexist. Differential and single-ended models do not work connected
to the same bus.
80 pin (single connector attachment)
The 80 pin SCA-2 models use an AMP connector (PN 5-917593-9) that is
compatible with the specification of: 'Single connector attachment for
small SCSI disk drives' SFF-8046. It can transfer data in both 8 bit
(narrow) and 16 bit (wide) modes.
Note: The SCA-2 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 lenths 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.
SCSI 3 fast 20 models can be cable connected to a 3 meter (9.8 feet)
cable when a maximum of 4 devices are attached, and a 1.5 meter
(4.9 feet) cable with up to 8 devices attached.
SCA-2 connector models are not designed for direct cable attachment
due to the combination of power and SCSI bus signals. Fast & fast
20 data transfers with SCA models should follow all of the ANSI SCSI
guidelines.
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 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. Ultrastar 2XP 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 drives 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 pin SCSI 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:
50 pin model 68 pin model
terminators terminators
------------ ------------
Data Mate Data Mate
DM2000-02-R DM2050-02-68S
DM500-06-R DM2050-02-68R
Single-ended SCSI terminators
Differential models do not have internal SCSI bus terminators. Some
terminator possibilities are shown below:
50 pin model 68 pin model
terminators terminators
------------ ------------
Data Mate Data Mate
DM550-05-0 DM2050-01-68D
DM1050-02-0
Differential SCSI terminators
Note: A Meritec model 940900-4 or a DataMate DM5000-5068-11
can be used to connect a 68 pin connector to a 50 pin
connector. The drive will 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. 68 pin models can source up to 2.0
Amps of current at 5.0 Volts (+/-5%) for termination power. 50 pin
models can source up to 15 Amps of current at 5.0 Volts (+/-5%) for
termination power.
SCSI bus termination power short circuit protection
The ANSI SCSI 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 2 Amps. UL has a different requirement
that they call the 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 electronic 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.
Jumper settings
---------------
Jumper position and function are as shown below. Pin pitch is 2 mm.
Termination power enable 2.54 mm pitch.
External activity LED Write protect
│ │
Master sync │ │ Auto start delay
│ │ │ │
Ground │ │ │ │ Option block mode
│ │ │ │ │ │
Auto start │ │ │ │ │ │ Disable sync negotiations
│ │ │ │ │ │ │ │
Blank │ │ │ │ │ │ │ │ Disable SCSI parity
│ │ │ │ │ │ │ │ │ │
SCSI address │ │ │ │ │ │ │ │ │ │ Disable unit attention
2 1 0 │ │ │ │ │ │ │ │ │ │ │ Customize
│ │ │ │ │ │ │ │ │ │ │ │ │ │ │
1 3 5 7 │ 11 13 15 17 19 21 23 25 27 29 31
┌───────────────────────────────────────────────┬──┬─────┬─
┌─┤o o o o o o o o o o o o o o o │ │ 0 0 │
├─┤o o o o o o o o o o o o o o o o │ └─────┘
│ └───────────────────────────────────────────────┘ │ │
│ 2 4 6 8 12 14 16 18 20 22 24 26 28 30 32 └─┤
│ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │
│ └──┴──┴──┘ │ │ │ │ └──┴──┴──┴──┴──┴──┘ │
│ Gound Ground │ │ │ Ground Termination
│ │ │ │ power enable
└─Blank pins │ │+5V
on 50 pin models │ │
│ Slave sync
Enable active termination
Option block mode
│
│ Alternate mode bit (reserved)
│ 3 2 1 0
23 25 27 29 31
─┬─┬────────────┬──┬─────┬─
│o│ o o o o │ │ 0 0 │
│o│ o o o o │ └─────┘
─┴─┴────────────┘ 1 2
24 26 28 30 32
│ │ │ │ │
└──┴──┴──┴──┘
Ground
50 pin single ended front option jumper block and termpower block
External activity LED Write protect
│ │
Master sync │ │ Auto start delay
│ │ │ │
Ground │ │ │ │ Option block mode
│ │ │ │ │ │
Auto start │ │ │ │ │ │ Disable sync negotiations
│ │ │ │ │ │ │ │
Blank │ │ │ │ │ │ │ │ Disable SCSI parity
│ │ │ │ │ │ │ │ │ │
SCSI address │ │ │ │ │ │ │ │ │ │ Disable unit attention
3 2 1 0 │ │ │ │ │ │ │ │ │ │ │ Customize
│ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │
1 3 5 7 │ 11 13 15 17 19 21 23 25 27 29 31
┌───────────────────────────────────────────────┬──┬─────┬─
│o o o o o o o o o o o o o o o │ │ 0 0 │
│o o o o o o o o o o o o o o o o │ └─────┘
└───────────────────────────────────────────────┘ │ │
2 4 6 8 12 14 16 18 20 22 24 26 28 30 32 └─┤
│ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │
└──┴──┴──┘ │ │ │ │ └──┴──┴──┴──┴──┴──┘ │
Gound Ground │ │ │ Ground Termination*
│ │ │ power enable
│ │+5V
│ │
│ Slave sync
Enable active termination
**Enable narrow mode
Option block mode
│
│ Alternate mode bit (reserved)
│ 3 2 1 0
23 25 27 29 31
─┬─┬────────────┬──┬─────┬─
│o│ o o o o │ │ 0 0 │
│o│ o o o o │ └─────┘
─┴─┴────────────┘ 1 2
24 26 28 30 32
│ │ │ │ │
└──┴──┴──┴──┘
Ground
68 pin single ended front option jumper block and termpower block.
68 pin differential & 80 pin SCA front option jumper block
*Not available on 80 pin SCA
**68 pin differential & 80 pin SCA
68 pin auxiliary connector
│
┌══════════════════════════│════════════┐
│ │ │
│ │ │
│ │ │
│┌──────────────────┐┌─────┼┐╔═══════╗ │
││::::::::::::::::::││::::::│║o o o o║ │
└┴──────────────────┴┴──────┴╚═══════╝──┘
Enable SCSI terminator
│
│ SCSI ID
+5V │ 3 2 1 0
│ │ │ │ │ │
Pin # 11 9 7 5 3 1
┌──────────────────┐
│ o o o o o o │
│ o o o o o o │
└──────────────────┘
12 10 8 6 4 2
│ │ │ │ │ │
Write protect │ │ │ │ Unused
│ │ │ │
Ground │ │ Auto spin up
│ │
External activity LED Slave sync
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 of 68 and 80 pin models
Bit 3 Bit 2 Bit 1 Bit 0 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
Bit 2 Bit 1 Bit 0 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
Auto start and 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 maek the drive spin
and be ready for media access operations. When in auto-star 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 Drive
interface pin models) behavior
--------------------- ---------
Auto start/ Auto start Auto start Delay(sec)
delay multiplier
off off No N/A
off on Yes 0
on off Yes 10
on on Yes 4
Pins (80 interface Drive
pin models) behavior
------------------ --------
Auto start/ Auto start Auto start Delay(sec)
delay multiplier
off off Yes 0
off on No N/A
on off Yes 10
on on No N/A
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 Ultrastar 2XP interface
specification for a detailed functional description of this pin,
which is controlled by mode select (page 0).
Up to 33 mA (+/-5%) of TTL level LED drive capability is provided.
Current limiting for the LED is provided on the electronics card.
The LED andode may be tied to the +5V source provded 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: 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 Ultrastar 2XP 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 is
reserved for future use.
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 Ultrastar 2XP interface specifications 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 14 will cause the 68 pin differential or the 80
pin SCA-2 to operate in a single byte mode. The drive will not
negotiate for "wide" (double byte) operation. Teh drive will
terminate the unused upper byte and upper byte parity on the SCSI bus.
Enable active termination
Single ended 50 and 68 pin models are available with on card SCSI bus
active terminators. The active termination feature 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 pin
SCSI models. SCA-2 80 pin and 68 pin differential have no termination.
Data organization
-----------------
DCHS-34550
Disks 5
User data heads 9
Seek times
Single cylinder (read) 0.5 msec
(write) 2.0 msec
Average (weighted) (read) 7.5 msec
(write) 9.5 msec
Full stroke (read) 14.5 msec
(write) 16.5 msec
User capacity for several block lengths
User bytes/ formatted logical blocks/
logical block capacity (bytes) drive
512 8,888,543 17,796,077
514 8,871,650 17,762,201
520 8,639,864 17,298,449
522 8,612,171 17,242,973
524 8,555,471 17,129,573
528 8,493,749 17,005,796
536 8,400,149 16,818,569
688 6,696,665 13,408,181
740 6,263,171 12,540,473
User bytes/logical blocks 512 to 5920
Mode select options
-------------------
Certain parameters are alterable using the SCSI mode slect command.
This allows certain drive characteristics to be modified to optimise
performance on the paticular system. Refer to the Ultrastar 2XP
interface specifications for a detailed definition of mode select
parameters.
The changeable parameters are:
Page 0 - Vendor unique parameters
QPE - Qualify posted errors
DWD - Disable write disconnect
ASDPE - Additional save data pointer enable
CMDAC - LED active
RPFAE - Report predictive failure analysis
Error bit
DOTF - Disable ECC on the fly
RRNDE - Report recovered non data errors
CPE - Concurrent processing enable bit
DLRO - Disable latency reduction optimization
TCC - Track compensation
DSN - Disable target initiated synchronous
negotiation
FRDD - Format and reassign degraded disable
DPSDP - Data phase save data pointer
CAEN - Command age
LITF - Idle time function
ADC - Adaptive cache enable
QEMC - Queue error management control
DRD - Disable read disconnect
LED - LED control
DRRT - Disable read reassign target
DUASS - Disable unit attention on spindle sync
RARRED - Report automatic/recommend rewrite/
reallocate disabled
FFMT - Fast format enable
VMC - Video mode configure
RTP - Reassign target padd
RRC - Read retry count
FCERT - Format certification
RCPF - Report component PFAGEM failures
DRPDV - Disable reassign blocks post move verify
DSF - Discard surface analysis results
Page 1 - Error recovery parameters
AWRE - Automatic write reallocation enable
ARRE - Automatic eead reallocation enable
TB - Transfer block
RC - Read continuous
PER - Post error
DTE - Disable transfer on error
DCR - Disable correction
Read retry count
Correction span
Head offset count
Data strobe offset count
Write retry count
Recovery time limit
Page 2 - Disconnect/reconnect parameters
Read buffer full ratio
Write buffer empty ratio
Bus inactivity limit
Disconnect time limit
Connect time limit
Maximum burst size
DTDC - Data transfer disconnect control
DIMM - Disconnect immediate
Page 4h - Rigid disk drive geometry parameters
RPL - Rotational position locking
Rotational offset
Page 7h - Error recovery parameters for verify
PER
DCR
Verify correction span
Verify retry count
Verify recovery time limit
Page 8h - Caching parameters
WCE - Write cache enable
MF - Multiplication factor
RCD - Read cache disable
Demand read retention priority
Write retention priority
Disable pre-fetch transfer length
Minimum pre-fetch
Maximum pre-fetch
Maximum pre-fetch ceiling
Number of cache segments
Page 0Ah - Control mode parameters
RLEC - Report log exception condition
Queue algorithm modifier
QErr - Queue error management
DQue - Disable queuing
EECA - Enable extended contingent allegiance
Page 0Ch - Notch parameters
Active notch
Models
------
The DCHS-34450 comes in a variety of models as follows:
SCSI 2 Fast (50 pin single-ended)
SCSI 2 Fast (68 pin single-ended and differential)
SCSI 3 Fast 20 (68 pin single-ended and differential)
SCSI 3 Fast 20 (80 pin single-ended SCA-2)
DCHS Model No. SCSI pins/connector type SCSI signal type
-------------- ------------------------ ----------------
04F 50 SEF
04W 68 SEFW
04E 68 DFW
04S 80 SCA-2 SEFW
04U 68 SEF20W
04X 68 DEF20W
04Y 80 SCA-2 SEF20W
Notes:
*SEF stands for single ended fast
*SEFW stands for single ended fast wide
*DFW stands for differential fast wide
*SEF20W stands for single ended fast 20 wide
*DEF20W stands for differential fast 20 wide
*50 pin SCSI connector models offer an 8
bit SCSI bus using the SCSI 'A' connector.
*68 pin SCSI connector models offer 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
and the U, X and Y models also support
SCSI-3 fast 20 data transfer.
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:
1)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.
2)Should the drive be the master drive, (master sync mode), it
outputs its INDEX on the -MASTER SYNC and the -SLAVE SYNC lines.
The master drive does not synchronize its index to any other
device. It simply outputs its INDEX.
3)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.
4)In the non-sync mode, the drive will receive the -SLAVE SYNC
signal, but it is not used by the drive.
Spindle synchronization control lines
--------------------------------------------------------------
| -MASTER SYNC | -SLAVE SYNC | Functional Mode |
|----------------|------------------|------------------------|
| released | receive | Slave sync |
| drive | drive | Master sync |
| drive | receive | Master sync control |
| released | receive | non sync |
--------------------------------------------------------------
Spindle synchronization functional modes
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 Ultrastar 2XP interface specification
for further information on the rotational offset of synchronized
spindles.
Power up Start-up sequence
<────────────><─────────><──────────><───────────><────><──────────>
│Reset init │ │ │ │ │ Complete │
│and test of │ Spin-up │ Init serve│ Upload code│ BATS2│ reassign │
│controller │ │ │ │ │ │
│ │ │ │ │ │ │
│ │ │ │ │ │ │
│Enable SCSI │ │ │ │ │ │
│ bus │ │ │ │ │ │
├────────────┴──────────┴───────────┴────────────┴──────┴──────────┘
│ │ │
│ │ │
Power on Auto start function enabled or │
start unit command issued at this time. │
│
│
File ready to accept read & write commands
Synchronization time
The SCSI mode select command is used to select the spindle sync
mode. It could take up to 5.0 seconds (2.5 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. which show the location of these signal
lines on the option jumper block. 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.
Termination
Bus termination of the -MASTER SYNC and -SLAVE SYNC signals is
internal to the drive. These two signals each have a 5 K ohm
pullup to the +5 volt supply. A maximum of 30 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
1)maximum bus length = 6 meters
2)2 micro-second negative active pulse (when sourced by drive)
3)minimum of 1 micro-second negative active pulse when
externally sourced
4)0.8 volts = max valid low input
5)2.2 volts = min valid high input
6)0.4 volts = low output
7)Vcc volts = high output
8)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 Ultrastar 2XP drive, the period of input signal must be 8.333
msec with a tolerance of +/-.025%.
Mechanical specifications
-------------------------
Weight
Approximately 1.0 pounds (0.46 kilograms)
Dimensions Inches S.I. Metric
---------- ------ -----------
Height 1.00 in 25.4 mm
Width 4.00 in 101.6 mm
Depth 5.75 in 146.5 mm
Clearances
For proper cooling it is suggested that a clearance of 7 mm be
provided under the drive and on top of the drive.
Mounting
Refer to Ultrastar 2XP hardware/functional specification 'drive
mounting guidelines' for more details on how to mount the drive.
The drive can be mounted with any surface facing down. The drive
has both side and bottom mounting holes. Refer to the diagrams below
for the location of these mounting holes for each configuration.
The maximum allowable penetration of the mounting screws is 3.8 mm.
Screws longer than 3.8 mm may cause permanent damage to the drive.
The recommended torque to be applied to the mounting screws is 0.8
Newton meters +/-0.2 Newton meters.
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 drives mounting frame must be within +/-150 millivolts of the
drives power supply ground. At no time should more than 35 milliamps
of current (0 to 100 Mhz) be injected into the disk enclosure.
Temperature measurements
The following is a list of measurement points and their temperature
(maximum and reliability). Maximum temperature 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 and reliable operating temperature limits
Maximum Optimum
Disk enclosure top 149 F (65 C) 122 F (50 C)
Disk enclosure bottom 149 F (65 C) 122 F (50 C)
Channel module (1) 194 F (90 C) 176 F (80 C)
SCSI module 176 F (80 C) 140 F (60 C)
Microprocessor module 203 F (95 C) 167 F (75 C)
Controller module 212 F (100 C) 167 F (75 C)
Spindle motor
driver module 194 F (90 C) 176 F (80 C)
Voice call driver 221 F (105 C) 176 F (80 C)
Note: Operating the file above the maximum temperatures may cause
permanent damage. For continuous read applications the channel
module will run at higher temperatures and will require
additional coolling.
Note: The diagrams below define where measurements should be made.
Showing where the modules are located on the bottom side of the
card and the measurement locations on the bottom or top of the
casing. There must be sufficient air flow through the drive so
that the casing and module temperature limits defined above are
not exceeded.
Module temperature measurement notes:
Center on the top surface of the module
If copper tape is used to attache temperature sensors, it should be
no larger than 6 mm square.
Bezel (optional)
(6x) 6-32 UNC-2B │
│ │
┌─────────────────────────────────────┼──────┬──┬┐───────────────
│ │ └──┤│ 25.2 +/-0.5
┌─┤ │ ││ .
│ │ o o └─────o ││ ─────────────
└─┴───────┼────────┼──────────────────────────┼───┴┘ ──6.35 +/-0.5──
│ │ │.........60 +/-0.2........│.16││
│ │ │+/-││
│ │.............101.6 +/-0.2..........│0.4││
│ ││
│..................146 +/-0.5.....................││
│ 4.83
Location of side mounting holes
│44.45 +/-0.2 │---60.33 +/-0.4---│ 3.18 │
│ │ │+/-0.3│
──── ┌─────────────────────────────────────────────┬┐─────────
. ┌┴──┐ o o ││───── .
. │ ┌─┘ ┌─┐ ┌───┐ ┌─────┐ ┌┐ ┌───┐ ││ . .
. │ ├ └─┘ │ │ │ │ ┌──┐ ││ │ ├ ││ . .
. │ ├ ┌─┐ └───┘ │ │ └──┘ └┘ │ ├ ││ . .
. │ └─┐ │ │ │ │ ┌──┐ │ ├ ││ . .
. │ ┌─┘ └─┘ │ │ └──┘ │ ├ ││ . 104.14
. │ ├ ┌──────┐ └─────┘ ┌──────────┐ └───┘ ││ . .
101.6 │ ├ │ │ ┌───────┐ │ │ o ││ . .
+/- │ ├ │ │ │ │ │ │ ││ 95.24 +/-0.2
0.5 │ ├ │ │ │ │ │ │ ││ . .
. │ ├ └──────┘ │ │ │ │ ││ . .
. │ ├ └───────┘ │ │ ├┼─ Bezel.
. │ └─┐ └──────────┘ ││ . .
. └┬──┘ o o ││───── .
──── └═════════════════════════════════════════════┴┘──────────
||-4.83
┌────────────────────────────────────┬──┬┬───┬─┐
┌┴┐ o o ├──┤├───┤ │
│ │ └──┤├───┤ │
│ │ \─┴┴───┴─┤
│ │ │
│ │ │
│ │ │
│ ├─────────────────────────────────────────────┤
│ ├────────────────────────────┬────────────────┤----
│ │ │ │ .
│ │ │ │ .
│ │ │ │41.86
│ │ │ │ .
│ │ │ │ .
└┬┘ o │ o │ .
└─────────────────────────────┼────────────────┘----
Disk Enclosure|Top |
|...58.53...|
Spindle motor driver module
│
│ │..........89.7.............│
┌──────────────┼───┼──────────────────────────┬┬────────────
┌┴──┐ o │ │ ┌──┐o ┌──┐ ││ .
│ ┌─┘ ┌─┐ ┌─┼─┐ ├─────┐ └──┘ └──┘ ┌───┐││ .
│ ├ └─┘ │ └─┼─┼─ │ ┌──┐ ┌──┐ │ ├││ 38.5
│ ├ ┌─┐ └───┘ │ │ └──┘ └──┘ │ ├││ .
│ └─┐ │ │ │ │ ┌────────┐ │ ├││ .
│ ┌─┘ └─┘ │ │ │Control │ │ ├││ .
│ ├ ┌──────┐ ├─────┘ │module │ └───┘││ .
│ ├ │ │ ═════│══════ ─┼────────┼─┬──┬───┼┼────────────
│ ├ │ │ ══│══│══════ │ │ │ ├───┼┼──VCD
│ ├ │ │ ══│══ ══════ └────────┘ └──┘ ││ module
│ ├ └──┼───┘ │ ┌───────┐ ┌────┐ ││
│ ├ │ │ │ │ │ ─┼──┼┼─ Channel
│ └─┐ │ │ │ ────┼──────────┐│ │ ││ module
└┬──┘ │ o │ └───────┘ o │└────┘ ││
└══════│════════│════════════════════│════════┴┘
│ Disk Enclosure Bottom │
│ │
SCSI module Microprocessor
