Page 1
IBM OEM Storage Products
Ultrastar 2XP
DCHS-34550 and DCHS-39100
IBM OEM has introduced a new range
of disk drives intended for advancedstorage applications which demand fast
access to large amounts of data.
The drives spin at 7200 rpm have an
EPRML channel, embedded sector
servo, S.M.A.R.T and media data rate
10.3–15.4MB/s.
Applications
●
Technical/commercial workstations
●
Network servers
●
Mass storage arrays
●
High end personal computers
●
Large scale imaging and graphics
●
Video servers
●
Video editing
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)
Features Benefits
●
4550 and 9111MB formatted capacity
●
Popular capacity points.
(512 byte/sector)
●
Industry standard inter face
– 50 pin ANSI SCSI-2
– 68 pin ANSI SCSI-2
– 68 pin ANSI SCSI-3
– 80 pin ANSI SCSI-3
●
10.3/15.4 MB/s media data rate
●
Rotational speed 7200 rpm
●
Average seek time 7.5 ms (4.55GB) 8.5 ms (9.10GB)
●
Latency 4.17 ms
●
512 KB multi-segmented dual port da ta buf fer
●
Spindle Synchronisation
●
Low command overhead
●
ECC on the fly (EOF)
●
Industry standard mounting
●
Predictive Failure Analysis (S.M.A.R.T. Compliant)
●
Read ahead caching
●
High interface data rates
●
– 10MB/sec data transfer speed
●
– 20MB/sec data transfer speed
●
– 40MB/sec data transfer speed
●
– 40MB/sec data transfer speed
●
High data rate across entire disk surface
●
Fast access to data
●
Fast data retrieval in single and multi-tasking applications
●
Data Server Applications
●
Improved data throughput
●
Ease of installation
●
High reliability and availability
Page 2
Connectors
Option Block
The electrical connectors are located as
shown.
Pin 1
Electrical Connectors (rear view) 80 Pin SCA models
Aux. Connector Pin 1
SCSI Pin 1
Pin 35
Electrical Connectors (rear view) 68 Pin models
Power Pin 1
4 3 2 1
Pin 2
Power Pin 1
SCSI Pin 1
Jumper Setting
Jumper position and function are as shown below. Pin pitch is 2 mm.
Termination power enable 2.54 mm pitch.
External Activity LED
Master Sync
Ground
Auto Start
Blank
SCSI Address
1
0
2
1 3 5 7 11 13 15 17 19 21 23
4 6 8 10 12 14 16 18 20 22 24
2
Ground
Blank Pins
on 50 Pin Models
Enable Active Termination
+5 v
Slave Sync
Write Protect
Auto Start Delay
Option Block Mode
Option Block Mode
232425 27 29 31
Disable Sync Negotiations
Disable SCSI Parity
Disable Unit Attention
Customize
25 27 29 31
26 28 30 32
GroundGround
Alternate Mode Bit (Reserved)
2
3
1
Termination
Power Enable
0
12
4 3 2 1
Electrical Connectors (rear view) 50 Pin models
Pin 1
(15x)2 mm
2.54 mm*
Jumper Pin locations (front view) - all models
* N ot avai lab le on 8 0 P in S CA.
Note:See electrical interface specifications
for power pin assignment.
The DC power connector is designed
to mate with AMP part 1-480424 (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
+5V GND GND +12V
50 Pin Single Ended Front Option Jumper
Block and TermPower Block.
External Activity LED
Master Sync
Ground
Auto Start
Blank
SCSI Address
1
3
1 3 5 7 11 13 15 17 19 21 23
2
Enable Active Termination
**Enable Narrow Mode
0
2
4 6 8 10 12 14 16 18 20 22 24
Ground
Slave Sync
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.
Write Protect
+5 v
26 28 30 32
Ground
Auto Start Delay
Option Block Mode
Disable Sync Negotiations
Disable SCSI Parity
Disable Unit Attention
25 27 29 31
26 28 30 32
GroundGround
Option Block Mode
Alternate Mode Bit (Reserved)
1
2
3
232425 27 29 31
26 28 30 32
Ground
Customize
Termination *
Power Enable
0
12
Page 3
68 Pin Auxiliary Connector
Auto Start and Delay pins
External Activity (L ED) Pins
Enable SCSI Terminator
(unused for differential models)
SCSI Address
+5v
11
Pin #
12 10
Write Protect
Ground
External Activity LED
1D2
1D3
97531
1D1 1D0
8642
Unused
Auto Spin up
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.
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
68 and 80 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
Address Determination of
50 pin models
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.
Pins (50 and 68 Drive
interface pin models) Behaviour
Auto Auto Auto Delay (sec)
Start Delay Start Start Multiplier
off off No N/A
off on Yes 0
on off Yes 10
on on Yes 4
Auto-Startup Modes selectable by
Auto-Start/Delay Pin Combinations
Pins (80 interface Drive
pin models) Behaviour
Auto Auto Auto Delay (sec)
Start Delay Start Start Multiplier
off off Yes 0
off on No N/A
on off Yes 10
on on No N/A
Auto-Startup Modes selectable by
Auto-Start/Delay Pin Combinations
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 mar keting
representative if you do not have an
approved shipping container.
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 33mA (±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: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.
Page 4
Disable T .I. S ync. Negotiation Pin
Data Organisation
DC Power Requirement Limits
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 By te) SCSI transfers are desired.
Please refer to the Ultrastar 2XP 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 13 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. The drive will terminate the
unused upper byte and upper byte parity
on the SCSI Bus.
Model 4.55GB 9.11GB
Disks 5 9
User data heads (trk/cyl) 9 18
Seek times (in milliseconds)
Single Cylinder (Read) 0.7 0.7
(Write) 2.0 2.0
Average (weighted) (Read) 7.5 8.5
(Write) 9.5 10.5
Full stroke (Read) 14.5 18.0
(Write) 16.5 20.0
User capacity for several
block lengths
4.55 GB Models
User bytes/ formatted logical
logical capacity blocks/
block (bytes) drive
512 4,550,934,016 8,888,543
514 4,560,028,100 8,871,650
520 4,492,729,280 8,639,864
522 4,495,553,262 8,612,171
524 4,483,066,804 8,555,471
528 4,483,066,804 8,555,471
536 4,502,479,864 8,400,149
688 4,607,305,520 6,696,665
740 4,634,746,540 6,263,171
9.11 GB Models
User bytes/ formatted logical
logical capacity blocks/
block (bytes) drive
51 2 9,111, 5 9 1, 4 2 4 17, 7 9 6 , 0 7 7
514 9,12 9,771,314 17,76 2,2 01
520 8,995,193,480 17,298,449
522 9,000,831,906 17,242,973
524 8,975,896,252 17,129,573
528 8,979,046,032 17,005,796
53 6 9,014,752,98 4 16,818,569
688 9,224,828,528 13,408,181
740 9,279,950,020 12,540,473
User bytes/logical block 512 to 740
The following voltage specification
apply at the drive power connector. There
are no special power on/off sequencing
requirements.
+5 Volt Supply ±5.0% (during run and spin up)
+12 Volt Supply ±5.0% (during run)
-7.0% -5.0% (during spin up)
4.55GB Power Supply Current +5VDC
Population
Notes Mean
Idle average 1.068 Amps
R/W average 1.094 Amps
R/W pulse peak 1.30 Amps
9.11GB Power Supply Current +5VDC
Idle average 1.085 Amps
R/W average 1.133 Amps
R/W pulse peak 1.30 Amps
4.55GB Power Supply Current +12VDC
Idle average 0.486 Amps
Seek peak 1.58 Amps
Spin-up 1.71 Amps
9.11GB Power Supply Current +12VDC
Idle average 0.85 Amps
Seek peak 2.05 Amps
Spin-up 2.71 Amps
Notes:
1. 5 Volt Current is given with termination power
provided by the using system.
2. 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
Power Supply Generated Ripple as seen
at drive power connector.
Voltage Maximum Notes
+5V DC 200mV peak-to-peak 0 – 20 MHz
+12V DC 200mV peak-to-peak 0 – 20 MHz
1
2
2
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 10 of the Auxiliary Connector
on 68 SCSI pin models. SCA-2 80 pin and
68 pin Differential have no termination.
Mode Select Options
Certain parameters are alterable using
the SCSI ‘Mode Select’ command. This
allows cer tain drive characteristics to be
modified to optimise performance on a
particular system. Refer to the Ultrastar
2XP SCSI Functional Specification for
a detailed definition of Mode Select parameters.
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 drives 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.
Page 5
ANSI SCSI ‘P’ connector specifications. It
Hot plug/unplug support
can transfer data in both 8 bit (narrow) and
16 bit (wide) modes. Both single-ended
The drives do support Hot Plug/Unplug
-refer to 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.
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.
Care must be taken not to exceed shock
limits whilst hotpluging or unpluging.
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.
80 Pin (Single Connector
Attachment)
Connector 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.
68 Pin SCSI Signal Connector
68 pin models use an AMP connector
(PN 786963-1) that is compatible with the
Note:The ‘SCA-2’ connector is not mechanically compatible with the 50 pin ‘A’ connector or
Models
DCHS Capacity GB SCSI Pins/ SCSI Electrical
Model No. (at 512 Byte) Connector Type Signal Type
04F 4.55 50 SEF
04W 4.55 68 SEFW
04E 4.55 68 DFW
04S 4.55 80 SCA-2 SEFW
04U 4.55 68 SEF20W
04X 4.55 68 DEF20W
04Y 4.55 80 SCA-2 SEF20W
09F 9.11 50 SEF
09W 9.11 68 SEFW
09E 9.11 68 DFW
09S 9.11 80 SCA-2 SEFW
09U 9.11 68 SEF20W
09X 9.11 68 DEF20W
09Y 9.11 80 SCA-2 SEF20W
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 metres (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 singleended “Fast” operations. This may include
a cable length of less than 6 metres.
SCSI 3 Fast 20 models can be cable
connected to a 3 metre (9.8 feet) cable
when a maximum of 4 devices are
attached, and a 1.5 metre (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 metres (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
metres for single-ended cables and 0.2
metres for differential cables. Ultrastar
2XP has a maximum internal stub length
of 0.05 metres on all ‘single-ended’ SCSI
signals, and 0.1 metres on all ‘differential’
SCSI signals. To remain compliant with the
standard the SCSI bus cable must not
add more than 0.05 metres additional stub
length to any of the single-ended SCSI
signals or 0.1 metres to any differential
SCSI signals.
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 model 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
and the U, X and Y models also support SCSI3 FAST 20 data transfer.
Page 6
SCSI Bus T erminators (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 10 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:
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 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. 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 1.5 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.
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 5% to 90% non-condensing
Storage 5% to 95% non-condensing
Shipping 5% to 100% (applies at the
packaged level)
Wet Bulb Temperature
Operating and
Storage 80°F (26.7°C) maximum
Shipping 85°F (29.4°C) maximum
Elevation
Operating –1000 to 10000 feet
(–304 to 3048 meters)
Shipping/Storage –1000 to 40000 feet
(–304 to 12192 meters)
Temperature
Operating ambient 41 to 122°F (5 to 50°C)
Operating disk
enclosure 41 to 149°F (5 to 65°C)
Shipping –40 to 149°F (–40 to 65°C)
Storage 34 to 149°F (1 to 65°C)
Temperature Gradient
Operating 36°F (20°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.
Page 7
Start and Stop Times
Vibration and Shock
Time Nominal Maximum Nominal Maximum
Models 4.55GB 4.55GB 9.11GB 9.11GB
Po we r Up 1.5 2.0 1.5 2.0
Start-up 25 60 30 90
Spin-up 9 25 11 27
Stop Times 6.0 15 9.0 15
All times in seconds
Bring-up Sequence Times and Stop Time
Power-up
Reset Init
and Test of
Controller
Enable
SCSI Bus
Power on
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.
Spin-up Init Servo Upload code BATS2
Auto Start function enabled
or Start Unit command issued at this time.
File Ready to accept Read and Write commands.
Start-up Sequence
Complete
Reassigns etc.
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 Ultrastar 2XP Interface Specification.
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
No permanent damage will occur to the
drive when subjected to a 10 G half sine
wave shock pulse of 11 milliseconds
duration.
The shock pulses are applied in each of
three mutually perpendicular axis, one
axis at a time.
Nonoperating Shock
No damage will occur if the unpackaged
drive is subjected to a square wave shock
less than 35 Gs applied to all three axis
for a period of 20 milliseconds, one
direction at a time.
Additionally, no damage will occur if the
unpackaged drive is not subjected to an
11 millisecond half sine wave shock
greater than 70 Gs applied to all three
axis, one direction at a time.
WARNING: This disk drive can
be damaged by Electro-Static
Discharge, please follow
recommended ESD procedures before
unpacking or handling the drive. Ask your
Dealer for details if you need assistance.
Spindle Synchronization
Refer to Ultrastar 2XP Hardware/
Functional Specification for spindle
synchronization overview.
Mechanical Specifications
Weight
4.55GB Approximately 1.0 pounds
(0.46 kilograms)
9.11GB Approximately 1.87 pounds
(0.82 kilograms)
Dimensions Inches S.I.Metric
Height
4.55GB 1.00 in 25.4 mm
9.11GB 1.63 in 41.3 mm
Width 4.00 in 101.6 mm
Depth 5.75 in 146.0 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.
Page 8
Mounting
T emperature Measurements
Refer to Ultrastar 2XP Hardware/
Functional Specification ‘Drive Mounting
Guidlines’ 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
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
metres ±0.2 Newton metres.
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.
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 Module1194°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 Coil Driver 221°F (105°C) 176°F (80°C)
Note:Operating the file above the maximum
temperatures may cause permanent damage.
1. For continuous read applications the channel
module will run at higher temperatures and will
require additional cooling.
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 of the or top 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 T emperature
Measurement Notes:
1. Centre on the top surface of the module.
2. If copper tape is used to attach temperature
sensors, it should be no larger than 6 mm square.
(4x) 0.5 Ref
__ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ _
Clearance min 7 mm
Location of side mounting holes
1. 41.3mm ± 0.5 for 9.11 GB models.
44.45 ± 0.2
101.6 ± 0.5
(6x) 0.5 Ref
(6x) 6-32UNC-2B
101.6 ± 0.2
146 ± 0.5
Bezel (optional)
60 ± 0.2
60.33 ± 0.4
Bezel
16 ± 0.4
4.83
3.18 ± 0.3
__ __
95.24 ± 0.2
__ __
4.83
6.35 ± 0.5
104.14
1. 25.2 ± 0.5
Disk Enclosure Top
Disk Enclosure
Bottom
SCSI
Module
Microprocessor
58.53
89.7
Spindle Motor Driver Module
Controller
Module
Channel Module
41.86
38.5
VCD Module
Page 9
IBM OEM Europe
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Business Machines Corporation.
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Other company, product and service names may be
trademarks or service marks of others.
Printed in England by Cedar Colour Limited
© International Business Machines Corporation 1996.
This data sheet is not a substitute for the full
production specification, which should be used
when detailed information is required.
Product Description data represents IBM’s design
objectives and is provided for comparative
purposes; actual results may vary based on a
variety of factors. This product data does not
constitute a warranty. Questions regarding IBM’s
warranty terms or methodology used to derive this
data should be referred to your IBM OEM
representative. Data subject to change without notice.
Date: 1st June 1996
Distributor:
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