Hitachi HUS157336EL3600 Installation and operation manual

Drawing No. Sheet No. Revision 5
K6602906 1/46 2003/6/12
OEM Manual
Hard Disk Drive Specifications
Ultrastar 15K73-73/36
(SCSI)
Models HUS157373EL3600 :(73GB/68pin)
Models HUS157336EL3600 :(36GB/68pin)
Models HUS157373EL3800 :(73GB/80pin)
Models HUS157336EL3800 :(36GB/80pin)
Hitachi Global Storage Technologies
©2003, Hitachi Global Storage Technologies. All Rights Reserved.
Read and follow all instructions and cautions for safety described
in this document before using the drive.
It is recommended that this manual is kept at a proper location
for quick reference.

Drawing No. Sheet No. Revision 5
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REVISION CONTROL
Remarks
AD: Addition , CH: Change ,CR: Correction ,DL: Deletion
Rev. Date Signature Page Description Remarks
02002/11/5DWN :O,Suzuki
CHKD: -
APPD: -
All First Issuance
12003/1/17 DWN :O,Suzuki
CHKD: -
APPD: -
3-5
11
27
Safety cautions were moved before
table of contents.
Seek time, Power requirement
Power dissipation
9.3 Storage
CH
CH
CH
22003/2/7 DWN :O,Suzuki
CHKD: -
APPD: -
1
11 Model Name Acoustic noise CR CR
32003/3/28 DWN :O,Suzuki
CHKD: -
APPD: -
11 Seek time, Power requirement
Power dissipation CH
42003/4/1 DWN :O,Suzuki
CHKD: T,Okazaki
APPD: K,Tsuneta
11
14
Power requirement, Power dissipation
Energy consumption rate
Power measurement (Operating)
CH
CH
52003/6/12 DWN :O,Suzuki
CHKD: T,Okazaki
APPD: K,Tsuneta
9
12
Regulations related to electro-
magnetic compatibility
Note5_2. Surface temperature
CH
CH

Drawing No. Sheet No. Revision 5
K6602906 3/46 2003/6/12
Read and follow all instructions and cautions described in this chapter before using the
drive. It is recommended that this manual is kept at a proper location for quick reference.
The description related to safety in this chapter may be changed without notice.
Influence for environment
Although this product emits electro-magnetic field, it will be found to be in compliance with
the EMI regulations such as VCCI class B, FCC Part 15 class B. However, anything other
than this product, such as an interface cable, is excluded. Therefore, the following cases
require a system side improvement.
(1) Disturbance of operations of other products or equipment
(2) Disturbance caused by other product, such as cabling, to operations of other products
or equipment.
Do not change the condition of the drive, excluding the change admitted by Hitachi.
Violating above-mentioned precautions will void any warranties of the HDD.
Please read and understand the following explanation for safety.
General cautions for safety
0.1.1 When handling the drive, follow all instructions and cautions described in this
manual and the packing specification manual.
0.1.2 The safety instructions in this manual are thoroughly considered, but unexpected
situations can occur. Not only follow the instructions in this manual, but also be
careful for the safety by yourself.
0.1.3 Do not convert or change the drive. Convert or change of the drive will void any
warranties.
0.1.4 It is customer’s responsibility to assure the actual system in which the drive is
installed meets the appropriate safety regulation. However the drive itself is found
to be compliance with the following standards:
UL 1950 3rd Edition
CAN/CSA C22.2-M95
IEC60950: 1991
EN60950: 1992
FCC Part15 Class B, VCCI Class B
EN55022: 1998, Class B (CE Mark)
AS/NZS 3548: 1995, Class B (C-tick)
CNS13438/C6357, Class B (BSMI)
RRL mark for Korean EMC
Headline of safety caution
Safety instructions and cautions are indicated as the following head line which means as
follows. This symbol indicates that potential danger may exist which may
cause slight or medium grade bodily injury if safety instructions are not
followed.
This symbol indicates that potential danger may exist which may
cause damage to the product or to the neighboring property if safety
instructions are not followed.
To use this product safely
Caution
Caution

Drawing No. Sheet No. Revision 5
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Followings are the cautions and contents described in this manual.
Items of indicating :
- Safety cautions for this product Page 4
Items of indicating :
- Safety cautions for this product Page 4-5
- Spindle Start and Stop Page 16
- Mounting of the drive Page 24
- Reliability temperature Page 26
- Precautions for handling Page 27
Safety cautions for this product
0.2.1 This product is not authorized for use in life support devices or other applications
which pose a significant risk of personal injury.
0.2.2 Handle the drive with care not to suffer bodily injury caused by hitting the edge of
the frame or accidental dropping of the drive.
0.2.3 Since the drive uses glass media for the disk platter, opening of HDA may cause
bodily injury. Warranty void in case of opened HDA or any broken HDA seals. Do
not open the HDA or break any HDA seals.
0.2.4 Temperature of the drive may become more than 50°C. Handle the drive carefully
not to get burned.
0.2.5 To prevent data from being lost due to an unexpected fatal error, data back up is
required.
0.2.6 If a foreign conductive substance (metallic powder, fluid, etc.) adheres to active
metal of the drive (Print pattern, component lead, etc. on Printed Circuit Board
(PCB)), it may cause catastrophic failures. Customer should protect the drive from
the above condition.
0.2.7 Improper insertion of connector or wrong jumper setting may cause catastrophic
failures. Referring to this manual prior to the connector insertion or jumper setting
can help insure correct insertion.
0.2.8 Follow the environmental conditions and power requirement described in this
manual. If violating these specifications, the drive failure may occur.
0.2.9 Protect the drive against Electro Static Discharge (ESD) during handling.
0.2.10 If storage period becomes long after unpacking, supply power to the drive and
rotate the disks 8minutes or more. This operation shall be executed every 3
months.
Caution
Caution
To use this product safely (Continued)
Caution
Caution

Drawing No. Sheet No. Revision 5
K6602906 5/46 2003/6/12
0.2.11 Protect the drive against shocks with the corrugated board and cushioning
material provided by the manufacturer, or with Hitachi Approved containers.
0.2.12 When mounting the drive, use the size of screws and the torque recommended in
this manual. If non-recommended size of screws and torque are used, it may
cause catastrophic failures.
0.2.13 Do not press top cover and bottom PCB of the drive. It may cause catastrophic
failures.
0.2.14 Read and follow all instructions and cautions described on the top cover of the
drive, and in the chapter, Precautions for handling, in this manual.
0.2.15 In case of fluctuations in the DC power (spikes, momentary shut off, etc.), the data
being recorded or to be recorded from buffer memory are not assured.
0.2.16If you find a smoke or a bad smell generating from the product, stop using it, turn
the power off, and see your sales contact.
0.2.17Do not cover the breathing hole on the surface of the drive with use of a seal.
Warranty and Limited Liability
This product is sold with a limited warranty and specific remedies are available to the
original purchaser in the event the product fails to conform to the limited warranty. Hitachi’s
liability may be further limited in accordance with its sales contact.
In general, Hitachi shall not be responsible for product damages caused by natural
disasters, fire, static discharge, misuse, abuse, neglect, improper handling or installation,
unauthorized repair, alteration, or accident. In no event will Hitachi be liable for loss of data
stored on product.
Hitachi shall not be liable for any special, incidental or consequential damages, even if
informed of the possibility thereof in advance.
Please see your sales contact for a complete statement of warranty rights, remedies and
limitation of liability.
To use this product safely (Continued)
Caution

Drawing No. Sheet No. Revision 5
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TABLE OF CONTENTS
Chapter Page
To use this product safely..................................................................................3
1Features...............................................................................................................8
2Standards and Related Documents..................................................................9
3Description..........................................................................................................10
3.1 Characteristics......................................................................................10
3.2 Environmental conditions and reliability.............................................11
4DC power Interface.............................................................................................15
4.1 DC Power Requirement.......................................................................15
4.2 Power Supply Current..........................................................................16
4.3 Spindle Start and Stop.........................................................................16
5Connecting Methods...........................................................................................18
6SCSI Interface.....................................................................................................20
6.1 Summary of SCSI Controller...............................................................20
6.2 Summary of SCSI Commands............................................................22
7Mounting and Handling.......................................................................................23
7.1 Orientations...........................................................................................23
7.2 Mounting of the drive ............................................................................24
7.3 Mounting dimensions ...........................................................................25
7.4 Precautions on the off-line test or bench test.....................................26
7.5 Cooling of the drive...............................................................................26
7.6 Reliability temperature.........................................................................26
8Precautions for handling.....................................................................................27
8.1 Packing..................................................................................................27
8.2 Transportation.......................................................................................27
8.3 Storage..................................................................................................27
8.4 Other Precautions.................................................................................28
9 Maintenance.........................................................................................................28
10 Physical interface................................................................................................29
10.1 Connector Specifications ....................................................................29
10.2 Cable Specifications............................................................................29
10.3 Connector Layout..................................................................................31

Drawing No. Sheet No. Revision 5
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11 Pin assignment....................................................................................................33
11.1 SCSI Bus Connector C1......................................................................33
11.2 Other connectors...................................................................................37
12 Jumper Socket setting........................................................................................39
12.1 Jumper connector layout......................................................................39
12.2 Jumper socket setting..........................................................................41
12.3 Jumper socket part number.................................................................46
12.4 Extension connector (for remote cable).............................................46

Drawing No. Sheet No. Revision 5
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1Features
The Ultrastar 15K73 series uses high performance sputtered disks, GMR heads, and a
rotary type voice coil motor to drive the heads. These features provide high capacity, high
speed positioning and high reliability.
The Ultrastar 15K73 series uses a SCSI interface for data transfer.
Related ANSI Specifications are as follows.
ANSI X3.301-1997(SCSI-3 Primary Commands)
X3T10/995D Rev 11a (SCSI-3 Primary Commands)
X3T10/996D Rev 8c (SCSI-3 Block Commands)
X3T10/1142D Rev 20a (SCSI Parallel Interface-2)
X3T10/1236-D Rev 20 (SCSI Primary Commands-2)
X3T10/1302D Rev 14 (SCSI Parallel Interface-3)
X3T10/1416D Rev 3(SCSI Primary Commands-3)
X3T10/1365D Rev 4(SCSI Parallel Interface-4)
Interface specifications for the Ultrastar 15K73 are found in the companion manual:
" Hitachi 3.5 inch Magnetic Disk Drive Reference Manualfor Ultrastar 15K73
(SCSI Interface Specification) ".
Table 1.1 Models
Product name Modelname Interface type Storage
capacity
(Formatted)
Ultrastar
15K73-73 HUS157373EL3600 Wide LVD (68pin-16bits) Ultra320 73.9GB
Ultrastar
15K73-36 HUS157336EL3600 Wide LVD (68pin-16bits) Ultra320 36.9GB
Ultrastar
15K73-73 HUS157373EL3800 SCA-2 LVD (80pin-16bits) Ultra320 73.9GB
Ultrastar
15K73-36 HUS157336EL3800 SCA-2 LVD (80pin-16bits) Ultra320 36.9GB
Note 1: This document may be changed without notice.

Drawing No. Sheet No. Revision 5
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2Standards and Related Documents
(a) Safety standards
It is the user’s responsibility to assure the actual system in which the drive is
installed meets the appropriate safety requirements. However, the drive was tested
to be in compliance with the following standards:
UL 1950 3rd Edition
CAN/ CSA C22.2-M95
IEC 60950: 1991
EN60950: 1992
(b) Regulations related to electro-magnetic compatibility
It is the user’s responsibility to assure the actual system in which the drive is
installed meets the appropriate EMI requirements. However the drive will be tested
using proper shielding and grounding to be in compliance with the following
regulations:
FCC Part 15, class B
VCCI class B
EN55022 class B
CNS13438,C6357 class B (BSMI)
AS/NZS 3548 class B (C-Tick)
RRL mark for Korean EMC
(c) Related Documents
(1) Hitachi 3.5 inch Magnetic Disk Drive Reference Manualfor Ultrastar 15K73
(SCSI Interface Specification)
K6602924
(2) Packing Specification
K6601289
(3) Ultrastar 15K73-73 (SCSI) Design Verification Test Reports
K6602907
(4) Ultrastar 15K73-36 (SCSI) Design Verification Test Reports
K6602908

Drawing No. Sheet No. Revision 5
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3Description
3.1 Characteristics Table 3.1 Characteristics
Item Specifications
Ultrastar 15K73-73 Ultrastar 15K73-36 unit
Configuration Storage capacity 73.9 36.9 GB
(formatted) (see Note 1,2,13)
Bytes/sector (see Note 3) 512, 516, 520, 524, 528,1024 Bytes
Number of disks 5 3
Number of heads 10 5
Areal density 31.2 Gb/inch2
Recording method MEEPRML
Performance Seek time average 3.9 / 4.2 ms
read / write full stroke 7.2 / 8ms
(see Note 5) 1 track 0.4/ 0.5ms
Average latency 1.99 ms
Rotational speed 15037 rpm
Data transfer rate (In drive) 684 – 960 Mb/s
Start time (see Note 5) 25 s
Data transfer
rate
(Controller)
Single-Ended Asynchronous
Fast-5
Fast-10
Ultra (Fast-20)
5.0 max.
10.0 max.
20.0 max.
40.0 max.
MB/s
(see Note 4) LVD Ultra2 (Fast-40)
Ultra160 (Fast-80)
Ultra320 (Fast-160)
80.0 Max.
160.0 max.
320.0 max.
Buffer size 8MBytes
Typ.
(Note5)
3sigma Typ.
(Note 5)
3sigma
Power 12V Spin-up, peak 2.20 2.44 2.20 2.44 A
requirement 12V Seek, peak 2.64 2.85 2.45 2.65 A
12V Idle, ave. 0.75 0.81 0.57 0.62 A
5V R/W, peak 1.54 1.65 1.54 1.65 A
5V Read, ave. 1.45 1.56 1.45 1.56 A
5V Write, ave. 1.20 1.28 1.20 1.28 A
5V Idle, ave. 0.60 0.64 0.60 0.64 A
Physical length x width x height 146.0x101.6x25.4 mm
dimensions weight 0.69 0.67 kg
Power
dissipation +12V Idle / +5V Idle, (Average) 12.0 9.8 W
Energy consumption rate (see Note 12) 0.162 0.266

Drawing No. Sheet No. Revision 5
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3.2 Environmental conditions and reliability
Table 3.2 Environmental conditions and reliability
Item Ultrastar 15K73-73 Ultrastar 15K73-36
Environmental operating 5 to 55°C
conditions Temperature non-operating -40 to 70°C
storage/shipping -40 to 70°C
Temperature gradient 20°C per hour maximum
Humidity operating 5 to 90%RH
non-operating 5 to 90%RH
Wet bulb temperature 29°C maximum (non condensing)
Atmosphere No corrosive gas,saline atmosphere
or organic-metal compound
(Example. organic silicon,organic tin)
Altitude operating -300 to 3,000 m
non-operating -300 to 12,000 m
Magnetic field 400 micro Tesla maximum
Shock and Vibration operating 9.8 m/s2(1.0G) maximum
vibration (see Note 6) non-operating 49 m/s2(5.0G) maximum
Shock operating 147 m/s2(15G) maximum [11ms]
(see Note 7) non-operating 735 m/s2(75G) maximum [11ms]
2450m/s2(250G) maximum [2ms]
Acoustic noise Acoustic noise (see Note 8) 3.7 bel average 3.6 bel average
Reliability Data Reliability (see Note 9) Recoverable error: 10 error in 1012bits read
Non-recoverable error: 1 error in 1014bits read
Seek error rate (see Note 9) 10 errors in 108seeks
(see Note 10) Life 5 years (Surface temperature of HDA is 45°C or less)
Life of the drive does not change in the case that the
drive is used intermittently. (See section 8.6)
MTBF (see Note 11) Expected 1,200,000 hours

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Note 1. Storage capacity does not include spare sector and spare cylinder.
Note 2. This is the value in the case that the drive is formatted to 512 Bytes/sector.
(1 gigabyte shows 1x109bytes on this document.)
Note 3. Ultrastar 15K73 is formatted to 512 Bytes/sector as the default.
If non-512 Bytes/sector is required, customer can change it by re-format
of the drive.
Note 4. Data transfer rate is degraded with cable or host condition or electrical noise.
Note 5. These specifications are typical under the following conditions:
1. Voltage is 5.0V/12.0V as measured on the edge of drive connector.
2. Surface temperature of HDA is 40°C.
If SCSI commands are issued during start-up (like TEST UNIT READY or
REQUEST SENSE) in less than 10 ms intervals, then the start-up time may be
extended.
Note 6. The disk drive orientation for vibration test is shown below.
Figure 3.1 Vibration test direction
Test conditions on vibration test are as follows.
(1) Operating
Acceleration frequency : 5 to 400 Hz,
Acceleration level : 9.8m/s2(1.0G)
Sweep rate : 0.5 octave / minute
Test cycle : 1 turn
(2) Non-operating
Acceleration frequency: 5 to 22 Hz, Maximum displacement: 2.56mm
Acceleration frequency: 22 to 400 Hz, Acceleration level: 49m/s2(5.0G)
Sweep rate: 0.5 octave / minute
Test cycle: 1 turn

Drawing No. Sheet No. Revision 5
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Note 7. The disk drive orientation for shock test is shown in Figure 4.2.
Figure 3.2 Shock test direction
Test conditions on shock test are as follows.
(1) Operating
147m/s2(15G) (Shock mode: half sine wave 11 ms, Test cycle: 5 times)
(2) Non-operating
735m/s2(75G) (Shock mode: half sine wave 11 ms, Test cycle: 5 times)
2450m/s2(250G) (Shock mode: half sine wave 2 ms, Test cycle: 5 times)
Note 8. Acoustic noise is measured except for the start, stop and seek operations.

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Note 9. Recoverable error is measured at the nominal condition with voltage,
temperature and default error recovery parameters.
Note 10. The drive should be mounted properly (see section 8).
Note 11. MTBF represents a prediction of performance based upon a large
statistical sample calculated in accordance with Hitachi's standard
procedures.
Hitachi does not warrant that the predicted MTBF is representative of any
particular unit or group of units comprising a customer base. The actual
failure rates will vary from unit to unit. Surface temperature of HDA is
50°C or less.
A failure defined by MTBF calculation is any event that requires repair or
replacement of HDD.
Note 12. Total idle mode power (W) / Total formatted capacity (GB)
Note 13. When theUltrastar 15K73-73 is formatted to 512 Bytes/sector,
the maximum Logical Block Address is (89B88FF)h.
When the Ultrastar 15K73-36 is formatted to 512 Bytes/sector,
the maximum Logical Block Address is (44DC47F)h.
Note 14. Power measurement values in operating (Random Seek/ Read/ Write) case are
shown in Table 4.3.
Table 3.3 Power measurement (Operating) Unit:(W)
Ultrastar 15K73-73 Ultrastar 15K73-36
30 IOs per second 13.2 10.9
60 IOs per second 14.5 12.1
90 IOs per second 16.0 13.6
(Measurement conditions:Random Read/Write,Block Length=8,Cache=off)

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4DC power Interface
4.1 DC Power Requirement
The drives are operated on DC power (+5V, +12V) only.
No power sequencing is required.
The +5 and +12 Volts can be applied in any order.
Table 4.1 DC Power Requirement
Power supply Voltage tolerance Allowed ripple and noise
+5V DC 5.0V +/-5% Less than 150mVp-p (0 - 100kHz)
Less than 100mVp-p (100kHz - 10MHz)
+12V DC 12.0V +/-5% Less than 150mVp-p (0 - 100kHz)
Less than 100mVp-p (100kHz - 10MHz)
Note 1. Voltage tolerance is measured at the DC power connector on the PCB.
The ripple current occurs during the motor start-up and seek.
Appropriate size of the DC Power cable is recommended to reduce the above
ripple and noise.
Note 2. In case of fluctuations in the DC power (spikes, momentary shut off, etc.), the
data being recorded or to be recorded from buffer memory are not assured.

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4.2 Power supply current
Fig 4.1 Current transition for +12V
Note: A retry Spin-up operation may be attempted during the Start up process.
4.3 Spindle Start and Stop
4.3.1 Start and Stop Time
Table 4.2 Start and Stop time
Item Typical unit
Start 25 Note 1 s
Stop 25 Note 2 s
Note 1. Start time means that the time of becoming ready, after DC power has been
applied in the case of Enable Auto Start mode, or after Start Unit command
(immed=0) has accepted in other case. If internal retry is executed during the Start-
up operation, the Start time may exceed typical value. It is recommended to have 60
seconds for the Start time. In the case of a spindle start-up failure, the time of an
internal retry operation is 130 seconds maximum.
Note 2. Beginning of stop time is basically decided by +12v DC power off.
In case of +5v DC power off only, stop time is 65sec(typ).
Do not move the driveuntilmotor stop completely.
Stop time means that the time to stop the spindle rotation, after DC power has
been shut off, or after stop operation has started.
Caution
+12V Current
[A]
1.0
0
2.0
3.0
Time [s]
0
2
4 6 8 10 12 14 16 18 20
T0
T1
T2
T3
T4
T1 : Accept start unit command or Auto Spin-up
T4 :Ready
T0 : Power on
T2-T3: Servo initialize
T3-T4: Upload Code etc.
T1-T4: Start up
T0-T1: Power up
T1-T2: Spin-up
Peak

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4.3.2 Spindle Start Selection
When multiple disk drives are connected to the same power supply and turned on
simultaneously, a large current will be required at power up.
In the above case, it is recommended to turn the motors on one by one at intervals in
order to minimize 12V line current.
This can be done according to the following 3 jumper pin configurations in the case of
NW drive:
1. If Disable Auto Start mode is set (C3:9-10 installed);
(1) Use a spindle start command for each drive, issuing it to the next drive after
receiving the previous drive’s Ready condition.
or
(2) Use the spindle start command for each drive, issuing it at intervals of more than
10 seconds.
2. If Enable Auto Start mode is set (C3:9-10 removed) and Spindle Start at Power On
is set (C3:13-14 removed);
Manually power on drives at intervals of more than 10 seconds.
3. If Enable Auto Start mode is set (C3:9-10 removed) and Delayed Start is set (C3:13-
14 installed);
Upon power on condition, the drives will automatically spin up in 10 second intervals
according to their SCSI ID. (The drive with the lowest SCSI ID will start first.)
In the case that their SCSI ID are more than 7, the drives will automatically spin up in
10 second intervals according to the numbers of (SCSI ID minus 8).
Note 1 The Delayed Start setting and the Auto Start setting can be done by commands
from host via SCSI bus connector (C1) in the case of NC drive.

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5Connecting Methods
5.1 Interface Cable (Daisy Chain)
Figure 5.1 Cabling layout
(WIDE LVD drive)
Note 1. The SCSI bus can accommodate a maximum of 16 units on a WIDE (16-bit) bus,
including the host processor, Ultrastar 15K73 units, and other SCSI devices.
Note 2. TheWIDE LVD and SCA-2 LVD drives do not have the terminator on the drive, so
an external terminator is required.
SCSI bus
DC power
GND
Ultrastar
15K73
Ultrastar
15K73 Ultrastar
15K73
Terminator
SCSI interface cable
power supply cable
Terminator

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5.2 Low voltage differential (LVD) mode
The NW and NC drives have two different transceivers to allow customer to use it in
traditional systems which may use single-ended drivers and receivers, or to use it in
low voltage differential (LVD) systems which use LVD drivers and receivers.
Their I/O circuits are selectable using the I/O "DIFFSENS" line. When the I/O
"DIFFSENS" line is between -0.35V and +0.5V, the drive interface circuits operate
single-ended. When "DIFFSENS" is between +0.7V and +1.9V, the drive interface
circuits operate LVD.
Customer can configure the drive to switch between single-ended and LVD modes
using the I/O "DIFFSENS" line, or force it to operate in single-ended mode only as
described later in this document.
Note 1: To operate at LVD mode, all devices on the same bus must be running in LVD
mode. If you add any single-ended device to a bus that is operating in LVD mode,
all devices drop back to operating in single-ended mode. This eliminates the
possibility of reaching Ultra-2 SCSI transfer rates.
Note 2: Do not mix LVD drives on the same daisy chain with devices having high voltage
differential (HVD) interface circuits.

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6SCSI Interface
6.1 Summary of SCSI Controller
The Ultrastar 15K73 SCSI controller interfaces between the drive and the host
computer with the Small Computer System Interface (SCSI).
(1) ANSI standard
The controller supports the SCSI interface that conforms to the ANSI specifications
shown in section 2.
(2) Compact design
The controller is embedded within the disk drive.
(3) Fast data transfer rate
The controller can transfer data via asynchronous mode, Fast-5 synchronous mode,
Fast-10 synchronous mode and Ultra (Fast-20) synchronous mode.
The controller can transfer data via Ultra2 (Fast-40) synchronous mode and Ultra160
(Fast-80) synchronous mode and Ultra320 (Fast-160) synchronous mode, as well as
above-mentioned transfer mode.
(4) FIFO buffer
The Ultrastar 15K73 SCSI controller has 8M bytes of FIFO buffer. This data buffering
feature prevents the SCSI controller from delay during the reconnect process and
reduces the latency time that is generated by the difference of the data transfer rate
between media and host.
(5) Automatic error retry
The controller automatically retries whenever the disk drive encounters errors.
(6) Automatic error corrections
The controller uses 40 bytes ECC and On-The-Fly to automatically correct read
errors, without latent rotational time.
(7) Parameter save feature
The controller saves the controller/device parameters (MODE SELECT parameters)
specified by the host onto the disk drive. The parameters are automatically restored at
power-on time.