Seagate ST32430N User manual

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HAWK 2LP Family:
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Product Manual,Volume 1
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ST31230N/ND
ST32430N/ND

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HAWK 2LP Family:
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Product Manual,Volume 1
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ST32430N/ND
ST31230N/ND

© 1996 Seagate Technology, Inc. All rights reserved
Publication Number: 77767471, Revision F
March 1996
Seagate®,SeagateTechnology®,andtheSeagatelogoareregisteredtrademarksofSeagateTechnology,Inc.
HawkTM, SeaFAXTM, SeaFoneTM, SeaTDDTM and SeaBOARDTM are trademarks of Seagate Technology, Inc.
Other product names are registered trademarks or trademarks of their own.
Seagate reserves the right to change, without notice, product offerings or specifications. No part of this
publication may be reproduced in any form without written permission of Seagate Technology, Inc.

Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F v
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Revision Status Summary Sheet
Revision Authorization Date Writer/Eng. Sheets affected
A Issue 8/29/94 D. Ashby v through viii, 1 through 59
R. Metzner
B PLD:86170 10/24/94 D. Ashby v, 12, 13, 37 through 41
C PLD:86221 12/15/94 D. Ashby v, 24 and 59
Gordon Douglas
D PLD: 86577 08/30/95 D. Ashby v and 33
E PLD: 86717 1/24/96 D. Ashby v, vi and 2
F PLD: 86769 v and 18
Notice:
Product Manual 77767471 is Volume 1 of a two Volume document with the SCSI interface information
in the Volume 2 SCSI Interface Product Manual, P/N 77738479.
If the SCSI Interface information is needed the Volume 2 Interface Manual should be ordered, P/N
77738479.

vi Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F
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Table of Contents
1.0 Scope.......................................................................................................................................... 1
2.0 Applicable standards and reference documentation.............................................................. 2
2.1 Standards ....................................................................................................................... 2
2.2 Electromagnetic Compliance for the European Unionn................................................... 2
2.3 Applicable reference documents..................................................................................... 2
3.0 General description ................................................................................................................... 3
4.0 Features...................................................................................................................................... 5
4.1 Performance ................................................................................................................... 5
4.2 Reliability ........................................................................................................................ 5
4.3 Unformatted and formatted capacities ............................................................................ 6
4.4 Options (factory installed) ............................................................................................... 6
4.5 Optional accessories (user installed) .............................................................................. 6
4.6 Installation....................................................................................................................... 7
5.0 Performancecharacteristics..................................................................................................... 8
5.1 Internal drive characteristics (transparent to user) .......................................................... 8
5.2 SCSI Drive Seek and write performance characteristics (visible to user)........................ 8
5.2.1 Access time ....................................................................................................... 8
5.2.2 Format drive command execution time .............................................................. 9
5.2.3 Read data command execution time.................................................................. 9
5.2.4 Write data command execution time .................................................................. 9
5.3 Generalized performance characteristics........................................................................ 10
5.4 Start/stop time................................................................................................................. 12
5.5 Prefetch/multi segmented cache control ......................................................................... 12
5.5.1 Cache operation................................................................................................. 12
5.5.2 Prefetchoperation.............................................................................................. 13
5.6 Caching write data .......................................................................................................... 14
6.0 Reliability specifications ........................................................................................................... 15
6.1 Error rates....................................................................................................................... 15
6.1.1 Read errors........................................................................................................ 15
6.1.2 Environmentalinterference ................................................................................ 15
6.1.3 Write errors ........................................................................................................ 16
6.1.4 Seek errors ........................................................................................................ 16
6.2 Reliability and service...................................................................................................... 16
6.2.1 Mean time between failure ................................................................................. 16
6.2.2 Preventivemaintenance..................................................................................... 16
6.2.3 Service life ......................................................................................................... 16
6.2.4 Service philosophy............................................................................................. 17
6.2.5 Installation.......................................................................................................... 17
6.2.6 Service tools ...................................................................................................... 17
6.2.7 Product warranty................................................................................................ 17
7.0 Physical/electricalspecifications ............................................................................................. 18
7.1 AC power requirements .................................................................................................. 18
7.2 DC power requirements .................................................................................................. 18
7.2.1 Conducted noise immunity................................................................................. 18
7.2.2 Power sequencing ............................................................................................. 19
7.2.3 12 V - current profile .......................................................................................... 19

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7.3 Heat/powerdissipation.................................................................................................... 20
7.4 Environmentallimits........................................................................................................ 20
7.4.1 Temperature ...................................................................................................... 20
7.4.2 Relative humidity................................................................................................ 21
7.4.3 Effective altitude (sea level ref) .......................................................................... 22
7.4.4 Shock and vibration ........................................................................................... 22
7.4.5 Air cleanliness.................................................................................................... 24
7.5 Electromagneticcompatibility.......................................................................................... 24
7.5.1 Electromagneticsusceptibility ............................................................................ 24
7.6 Mechanical specifications ............................................................................................... 25
7.6.1 Drive orientation................................................................................................. 26
7.6.2 Cooling............................................................................................................... 26
7.6.3 Drive mounting................................................................................................... 26
8.0 Mediacharacteristics ................................................................................................................ 27
8.1 Media description............................................................................................................ 27
9.0 Defect and error management .................................................................................................. 28
9.1 Drive internal defects/errors............................................................................................ 28
9.2 SCSI systems error considerations................................................................................. 28
10.0 Option/configuration headers................................................................................................... 29
10.1 Drive ID/Option select header ......................................................................................... 29
10.2 Grounding....................................................................................................................... 31
11.0 Interface requirement ................................................................................................................ 32
11.1 General description......................................................................................................... 32
11.2 SCSI interface messages supported............................................................................... 32
11.3 SCSI interface commands supported ............................................................................. 33
11.3.1 Inquiry data ........................................................................................................ 35
11.3.2 Mode sense data ............................................................................................... 36
11.4 SCSI bus conditions and miscellaneous Features supported ......................................... 41
11.5 Synchronous data transfer.............................................................................................. 42
11.5.1 Synchronous data transfer periods supported.................................................... 42
11.5.2 REQ/ACK offset ................................................................................................. 42
11.6 Physical interface............................................................................................................ 42
11.6.1 DC cable and connector..................................................................................... 44
11.6.2 Physical characteristics...................................................................................... 44
11.6.3 Mating connector requirements.......................................................................... 45
11.6.4 Electrical description .......................................................................................... 49
11.7 Disc drive timing ............................................................................................................. 53

viii Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F
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12.0 Options....................................................................................................................................... 55
12.1 Front panel...................................................................................................................... 55
12.2 Single unit shipping pack ................................................................................................ 55
12.3 Installationmanual .......................................................................................................... 55
13.0 Accessories ............................................................................................................................... 56
13.1 Front panel kit ................................................................................................................. 56
13.2 Additional Installation Guide copies ................................................................................ 56
14.0 Seagate support services ......................................................................................................... 57

Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F 1
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1.0 Scope
This Manual describes the Seagate Technology, Inc. Hawk 2LP family Disc Drives. This high capacity, high
performance member of the Seagate 1 inch high 3.5 inch rigid disc family is a next generation product from
the ST31200 disc drive. Performance information is given in Section 5. The Hawk 2LP family model drives
interfaceisdefinedforfunctionalcompatibilitytobeasubsetoftheSeagateSCSIInterfaceManual77738479,
andtheANSISCSI-2/SCSI-3standards.TheHawk2LPfamilydrivesareclassifiedas“Intelligent”peripherals.
The Hawk 2LP Family provides Level 2 conformance (highest level) with the ANSI SCSI-1 standard. Details
of the Hawk 2LP Family drive SCSI implementation are provided in Section 11 of this Manual, (Vol. 1) and in
the SCSI Interface Product Manual P/N 77738479 (Vol. 2; Ver. 2).
The Hawk 2LP family consists of ST32430N/ND and ST31230N/ND products.
FromthispointoninthisProductManualthereferencetoHawk2LPfamilymodelsisreferredtoas“thedrive”
(unless reference to individual models are necessary).
The drive printed circuit board is referred to as a PCB.
Figure 1-1. Hawk 2LP family drive
SEAGATE

2 Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F
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2.0 Applicable standards and reference documentation
Thedrivehasbeendevelopedasasystemperipheraltothehigheststandardsofdesignandconstruction.The
drive depends upon its host equipment to provide adequate power and environment in order to achieve
optimum performance and compliance with applicable industry and governmental regulations. Special
attention must be given in the areas of safety, power distribution, shielding, audible noise control, and
temperature regulation. In particular, the drive must be securely mounted in order to guarantee the specified
performance characteristics.
2.1 Standards
The Hawk 2LP Family complies with Seagate standards as noted in the appropriate sections of this Manual
and the Seagate SCSI Interface Manual, P/N 77738479 (Vol. 2, Version 2).
TheHawk2LP FamilyisaULRecognizedcomponentperUL1950andaCSACertifiedcomponentperCAN/
CSA-C22.2 No. 950-M89. It also meets the requirements of DIN VDE 0805:1993 and EN60950: 1992 (IEC
950).
Thedrive,asdelivered,isdesignedforsystemintegrationandinstallationintoasuitableenclosurepriortouse.
As such the drive is supplied as a subassembly and is not subject to Subpart J of Part 15 of the FCC Rules
and Regulations nor the Radio Interference Regulations of the Canadian Department of Communications.
However,theunithasbeentestedusingpropershieldingandgroundingandfoundtobecompliantwithClass
A limits of the FCC Rules and the Regulations of The Canadian Department of Communications.
Thephysicaldesigncharacteristicsofthedriveservetominimizeradiationwheninstalledinanenclosurethat
provides reasonable shielding. As such, the drive is capable of meeting the Class B limits of the FCC Rules
and Regulations of the Canadian Department of Communication. However, it is the users responsibility to
assure that the drive meets the appropriate EMI requirements in their system. Shielded I/O cables may be
required if the enclosure does not provide adequate shielding. If the I/O cables are external to the enclosure,
shielded cables should be used, with the shields grounded to the enclosure and to the host controller.
2.2 Electromagnetic Compliance for the European Union
If this model has the CE Marking it complies with the European Union requirements of the Electromagnetic
CompatibilityDirective89/336/EECof03May1989asamendedbyDirective92/31/EECof28April1992and
Directive 93/68/EEC of 22 July 1993.
Seagateusesanindependentlaboratorytoconfirm compliance to theabove directives. Thedrive was tested
in a representative system for typical applications. The selected system represents the most popular
characteristics for test platforms. The system configurations include:
• 486, Pentium, and Power PC Microprocessors
• 3.5-inch Floppy Disc Drive
• Keyboard
• Monitor/Display
Although the test system with this Seagate model complies to the directives, we cannot guarantee that all
systems will comply. The computer manufacturer or system integrator shall confirm EMC compliance and
provide CE Marking for their product.
2.3 Applicable reference documents
InstallationGuide Seagate P/N 77767475
SCSI Interface Manual Seagate P/N 77738479
ANSI Small Computer System Interface (SCSI): Document Number ANSI3.131-1986 (X3T9/84.40 Rev. 1B)
(X3T9.2/82-2 Rev. 17B), X3T9.2/86-109 Revision 10H (SCSI-2) and X3T9.2-184 Rev. 4 (SCSI-3).
Package Test Specification Seagate P/N 30190-001 (under 100 lb.)
Package Test Specification Seagate P/N 30191-001 (over 100 lb.)
In case of conflict between this document and any referenced document, this document takes precedence.

Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F 3
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3.0 General description
The drives are a member of a family of low cost, high performance, highly reliable, random access storage
devices designed to meet the needs of the OEM marketplace.
The drive records and recovers data on 3.7 inch (95 mm) fixed discs.
ThedrivesupportstheSmallComputerSystemInterfaceasdescribedintheANSISCSI-1,SCSI-2 andSCSI-
3 Interface Manuals to the extent described in this product Manual (Vol. 1), which defines the product
performance characteristics of the Hawk 2LP Family of drives, and the SCSI Interface Product Manual P/N
77738479 (Vol. 2, Version 2) which describes the general interface characteristics of this and other families
of Seagate 3.5-inch drives.
The drive interface supports multiple initiators, disconnect/reconnect, self configuring host software and
automaticfeaturesthatrelievethehostfromthenecessityofknowingthephysicalcharacteristicsofthetargets
(logical block addressing is used).
TheHead/DiscAssembly(HDA)isenvironmentallysealedatthefactory.AirrecirculateswithintheHead/Disc
(HDA) through a nonreplaceable filter to maintain a contamination free head/disc environment.
RefertoFigure3.0-1anexplodedviewofthedrive.NEVERdisassembletheHead/DiscAssembly(HDA).This
exploded view is for information only. Do not attempt to service items in the sealed environmental enclosure
(heads,media,actuator,etc.)asthisrequiresspecialfacilities.Thedrivecontainsnopartsreplaceablebythe
user. The drive warranty is voided if the HDA is opened.
The Hawk 2LP Family drives use a dedicated landing zone at the innermost radius of the media to eliminate
thepossibilityofdestroyingordegradingdata by landing in the datazone.Thedriveautomaticallygoestothe
landing zone when the power is removed.
The Hawk 2LP Family drives incorporate an automatic shipping lock which prevents potential damage to the
heads and discs that result from movement during shipping and handling. The shipping lock is automatically
disengaged when power is applied to the drive and the head load process begins.
TheHawk2LP Family drivesdecode tracklocationfromthededicated servosurface toeliminatemechanical
transducer adjustments and related reliability concerns.
TheHawk2LPFamilydrivesuseahighperformanceactuatorassemblythatconsistsofalowinertia,balanced,
patented, straight arm design that provides excellent performance with minimum power dissipation.

4 Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F
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Figure 3.0-1. Hawk 2LP family drive

Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F 5
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4.0 Features
The Hawk 2LP Family has the following standard features:
•Integrated SCSI Controller
•Single Ended and Differential SCSI drivers and receivers
•Asynchronous and Synchronous data transfer protocol
•Firmware downloadable via SCSI interface
•Selectable sector size from 256 to 4096 bytes/sector
•Programmable sector reallocation scheme
•Flawed sector reallocation at format time
•Programmable auto write and read reallocation
•Reallocation of defects on command (Post Format)
•96 bit Reed-Solomon error correcting code
•Sealed Head/Disc Assembly
•No preventative maintenance or adjustment required
•Dedicated head landing zone
•Automatic shipping lock
•Automatic Adaptive Thermal Compensation
•Patented Tri-phase Servo with embedded Grey Code Track Address to guarantee servo positioning.
•Self diagnostics performed at power on
•1:1 Interleave
•Zoned Bit Recording (ZBR)
•Vertical, horizontal, or top down mounting
•Dynamic spindle brake
•Permanently mounted terminators on "N" models, enabled by installation of a jumper plug.
•512 K byte data buffer
4.1 Performance
•Programmable multi-segmentable cache buffer
•5411 RPM Spindle. Average latency = 5.54 ms
•Command Queuing of up to 64 commands
•Background processing of queue
•Supports start and stop commands
•Low audible noise for office environment
•Low power consumption
4.2 Reliability
•800,000 hour MTBF
•Adaptive servo calibration for improved seek performance
•LSI circuitry
•Balanced low mass rotary voice coil actuator
•5 year warranty

6 Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F
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4.3 Unformatted and formatted capacities
Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes
per sector. The following table shows some typical 512 byte sector size [1] formatted capacities.
ST32430N/ND ST31230N/ND
GB GB
Spare Sector or Cylinders
Reserved for reallocation
No Spares 2.16 1.07
Five Spare Sectors per Cylinder [2] 1.06
Nine Spare Sectors per Cylinder [2] 2.14
2 Spare Cylinders per Unit [3] 2.16 1.07
One Spare Sector per Cylinder and 2.16 1.06
2 Spare Cylinder per Unit [3]
Unformatted Capacity 2.59 1.28
Notes.
[1] Sector size selectable at format time. Users having the necessary equipment may modify the data block
size before issuing a format command and obtain different formatted capacities than those listed. User
available capacity depends on spare reallocation scheme selected. See Mode Select Command and
Format Command in the SCSI Interface Product Manual P/N 77738479.
[2] All spare sectors are on one track.
[3] Spare cylinders are on the two inner tracks.
The standard OEM model is as follows:
Formatted Data Block Size Unformatted
512 Byte/Sector
ST32430N/ND 2.14 GB* 2.59 GB
ST31230N/ND 1.06 GB* 1.28 GB
* Sparing equivalent to one spare sector per head (all spare sectors are on one track), two spare cylinders/
unit.
Installation Guide P/N 77767473 is shipped with each drive unless otherwise requested.
4.4 Options (factory installed)
Thecapacitiesshowninparagraph4.3areavailableuponrequest.Othercapacitiescanbeordereddepending
on sparing scheme and sector size requested.
The following options are incorporated at the time of production. See Section 12.0.
•Front panel (green LED) - See Figure 3.0-1
•Single Unit shipping pack
4.5 Optional accessories (user installed)
The following accessories are available. All kits may be installed in the field. See Section 13.0.
•Front Panel Kit (with green LED) - See Figure 3.0-1
•Single Unit shipping pack kit
•AdapterAccessoryFrameKitP/N75790701(adapts3.5-inchdrivetofitin5.25-inchdrivemountingspace)

Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F 7
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4.6 Installation
For option jumper locations and definitions refer to Figure 10.1-1. Drive default mode parameters are not
normally needed for installation. Refer to Section 11.3.2 for default mode parameters if they are needed.
•Ensure that the SCSI ID of the drive is not the same as the host adapter. Most host adapters use SCS ID
7.
•Ifmultipledevices areonthebus set thedriveSCSIID toone thatisnot presently usedbyotherdevices on
the bus.
•If the drive is the only device on the bus, attach it to the end of the SCSI bus cable. Permanently installed
terminators must be enabled on the drive for "N" models using jumper plugTE. On "ND" models, external
terminators must be provided by the user, systems integrator or host equipment manufacturer.
•If the drive is attached to a bus that contains other devices, and the new drive is not attached to the end of
the bus, the Terminator Enable jumper (TE) should be removed from the new drive.
•Setallappropriateoptionjumpersfordesiredoperationpriortopoweron.Ifjumpersarechangedafterpower
has been applied, recycle the drive power to make the new settings effective.
•Installationinstructionsareprovidedbyhostsystemdocumentationorwithanyadditionallypurchaseddrive
installation software. If necessary see section 14.0 for Seagate support services telephone numbers.
•TheManufacturersinstalledlabelsmustnotberemovedfromthedriveorcoveredwithadditionallabels,as
they contain information required when servicing the product.
Formatting
•It is not necessary to low level format this drive. The drive is shipped from the factory low level formatted in
512 byte sectors.
•Reformat the drive if one of the following occurs.
- A different sector size is selected.
- A different spare sector allocation scheme is selected.

8 Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F
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5.0 Performance characteristics
5.1 Internal drive characteristics (transparent to user)
ST32430N/ND ST31230N/ND
Drive Capacity 2.59 ...................... 1.28 ...............GByte (UNF)*
Read/Write Heads 9 ........................... 5
Bytes/Track 72000 ................... 64242 ............Bytes (Avg)*
Bytes/Surface 287.7 .................... 255.6 .............Mbytes (UNF)
Tracks/Surface, Total 3992 ..................... 3992 ..............Tracks (user accessible)
Tracks/Inch 4200 ..................... 4200 ..............TPI
Servo Heads 1 ........................... 1
Internal Data Rate 35.8 - 62.2 ............ 33.9 - 56.7.....Mbits/sec (variable with zone)
Disc Rotational Speed 5411+ 0.5% .......... 5411+0.5%...r/min
Average Rotational Latency 5.54 ...................... 5.54 ...............ms
*Rounded off values.
5.2 SCSI Seek, Read and Write performance characteristics (visible to user) [8]*
The values given in section 5.2 apply to all models of the Hawk 2LP family unless otherwise specified. Refer
to Section 11.7 and to the SCSI-2 Interface Product Manual 77738479 for additional timing details.
5.2.1 Access time
Including Controller Overhead
(without disconnect) [1] [4]
Drive Level
Read Write
ms
Average -Typical [3]
10.4
11.4
Max. [2] 11.9 13.4
Single Track - Typical [3] 2.1 2.5

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5.2.2 Format drive command execution time (minutes) [1]*
ST32430N/ND ST31230N/ND
Maximum (with verify) 45 25
Maximum (no verify) 31 15
5.2.3 Read data command execution time [4]
(512 byte sector size, without disconnect and with read look ahead cache disabled.)
Latency time is included.
a. From CDB reception to the drive request for the first data byte to be transferred to the Host
1. Typical (Zero Stroke Seek) 7.32 ms [3]*
2. Typical (Average Seek) 17.14 ms [3]
3. Maximum (Full Stroke Seek) 31.78 ms [2]
b. Single Sector Read and Transfer of data to Host (time from receipt of last byte of the CDB to the request
for a status byte transfer to Host) [7].
1. Typical (Zero Stroke Seek) 7.42 ms [3]
2. Typical (Average Seek) 17.24 ms [3]
3. Maximum (Full Stroke Seek) 31.84 ms [2]
5.2.4 Write data command execution time [4]
(512 byte sector size, without disconnect and with read look ahead disabled.)
Latency time is included.
a. From CDB reception to the request for the first byte of write data from the Host.
1. Typical 1.49 ms 2. Maximum 1.61 ms
b. Single Sector Write and Data Transfer from Host [7] [6]
(Time from receipt of the last byte of the CDB to the request for a completion status transfer to the
Host)
1. Typical (Zero Stroke Seek) 7.72 ms [3]
2. Typical (Average Seek) 17.29 ms [3]
3. Maximum (Full Stroke Seek) 32.28 ms [2]
*[ ] All notes are listed in Section 5.3.1.

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5.3 Generalized performance characteristics
Minimum Sector Interleave (All Hawk 2LP models) 1 to 1
Data transfer rate (< 1 sector) - 512 Byte Sector, Data Buffer To/From Disc Media:
ST32430N/ND ST31230N/ND
Min. [4]* 4.48 MByte/sec 4.23 MByte/sec
Avg. [4] 6.50 MByte/sec 5.79 MByte/sec
Max. [4] 7.78 MByte/sec 7.09 MByte/sec
Data Transfer Rate (< 1 Track) - 512 Byte Sector, Data Buffer To/From Disc Media:
ST32430N/ND ST31230N/ND
Min. [4] 3.76 MByte/sec divided by (Interleave Factor) 3.56 MByte/sec
Avg. [4] 5.46 MByte/sec divided by (Interleave Factor) 4.87 MByte/sec
Max. [4] 6.54 MByte/sec divided by (Interleave Factor) 5.96 MByte/sec
SCSI Interface Data Transfer Rate (Asynchronous) [5] (All Hawk 2LP models)
N family ND family
-MaximumInstantaneous 5.2 [9] MBytes/sec 3.3 MBytes/sec
-Maximum Average 3.1 MBytes/sec 2.4 MBytes/sec
The remainder of the specifications of section 5.3 apply to all Hawk 2LP models:
Sector Sizes 512 byte user data blocks (default)
Variable (256 to 4096 bytes per sector) in even number of bytes per sector. If n (number of
bytes per sector) is odd, then n-1 will be used.
Synchronous Transfer Rate
From 1.25 MBytes/sec to 10.0 MBytes/sec (See section 11.5.)
Read/Write consecutive sectors on a track YES
Flaw reallocation performance impact (For flaws reallocated at format Negligible
time using the spare sectors per track reallocation scheme.) [10]
Flaw reallocation performance impact (For flaws reallocated at format time Negligible
using the spare sectors per cylinder reallocation scheme.) [10]
Flaw reallocation performance impact (For flaws reallocated at format 35 ms (typical)
time using the spare tracks per volume reallocation scheme.)
Overhead time for head switch (512 byte sectors) 1 ms
Overhead time for one track cylinder switch <3 ms Typical
Average rotational latency 5.54 ms
*[ ] Notes listed in Section 5.3.1

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5.3.1 Notes for sections 5.2 and 5.3.
[1] Execution time measured from receipt of the last Byte of the Command Descriptor Block (CDB) to the
request for a Status Byte Transfer to the Initiator (excluding connect/disconnect).
[2] Maximum times are specified over the worst case conditions of temperature, voltage margins and drive
orientation.Whencomparingspecified accesstimes,careshouldbetakentodistinguishbetweentypical
accesstimesandmaximum access times.Thebestcomparisonisobtainedbysystembenchmarktests
conducted under identical conditions. Maximum times do not include error recovery.
[3] Typical Access times are measured under nominal conditions of temperature, voltage, and horizontal
orientation as measured on a representative sample of drives.
[4] Assumes no errors and no sector has been relocated.
[5] Rate measured from the start of the first sector transfer to or from the Host.
[6] Assumes the Initiator immediately sends Write Data to the drive when requested.
[7] Commandexecutionrequiresadatatransferphase(datatoorfromthediscmedia).Assumestheinitiator
isinstantlyreadytosendorreceivethedatawhenthedrivegeneratesfirstrequestforadatabytetransfer,
andassumesanaveragedatatransferratebetweenthedriveandtheInitiatorasspecifiedinsection5.3.
[8] All performance characteristics assume that automatic adaptive temperature compensation is not in
process when the SCSI command is received. The following paragraphs give highlights of thermal
calibrationoperation.
a. At spin-up, all heads are calibrated on the outer and inner diameter calibration tracks.
b. A timed calibration occurs 1 minute after spin-up, and every 10 minutes thereafter. During these
timed calibrations, the firmware alternates between the inner and outer diameter calibration tracks.
For example, all heads are calibrated on the inner track, then 10 minutes later all heads are cali-
brated on the outer track.Automatic adaptive temperature calibration does not interrupt SCSI com-
mands being executed.
c. Ifautomatic adaptive thermal calibrationis in processwhen thedrivereceivesa SCSI command,the
drive queues the command until the compensation for the specific head being compensated com-
pletes.When compensation completes for the specific head being compensated, the drive executes
the first queued command.When execution of the first queued command completes, the drive con-
tinues compensation for the remaining head(s).The above procedure continues until the drive com-
pletes compensation for all heads.
d. Whena timedcalibration comesdue,thedrivepostponesthe calibrationuntil thedrive has beenidle
for 25 to 50 milliseconds.
e. When the drive receives aWrite command, the drive performs a single head calibration if a calibra-
tionhas beendelayedfor1to 5 minutes.The driveperforms an uninterruptiblecalibrationofall heads
if the calibration has been delayed more than 5 minutes.
f. The drive preforms a calibration of all heads prior to the first retry of any media error if a timed
calibration has been delayed for over one minute.
g. Automatic adaptive temperature compensation takes less than 0.1% of bus time.
h. Automatic adaptive temperature compensation occurs at times other than mentioned above, but
should be transparent to the user (e.g., during execution of Format, Rezero, and Reassign Block
commands).
i. A rezero command can be used to reset the Automatic adaptive temperature compensation timer
back to start so that the host can know when the interruption for timed thermal compensation will
occur.
[9] Assumes system ability to support 5.2 Mb/s and no cable loss.
[10] Simulated.
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*SCSI commands are described in the SCSI Interface manual, 77738479.

12 Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F
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5.4 Start/stop time
AfterDCpowerhasbeenapplied,thedrivebecomesreadywithin20seconds(15secondstypical)iftheMotor
StartOptionisdisabled(i.e.themotorstartsassoonasthepowerhasbeenapplied).Duringthistimethedrive
respondstosomecommandsovertheSCSIinterface*inlessthan3seconds.Stoptimeislessthan20seconds
from removal of DC power.
Ifthe Motor StartOptionis enabled,theinternal controlleracceptsthe commands listedinthe SCSIInterface
Product Manual* less than 3 seconds after DC power has been applied. After the Motor Start Command has
been received the drive becomes ready for normal operations within 13 seconds typically. The Motor Start
Command can also be used to command the drive to stop the spindle*.
There is no power control switch on the drive.
5.5 Prefetch/multi segmented cache control
The drive provides prefetch (read look-ahead) and multi-segmented cache control algorithms that in many
casescanenhancesystemperformance.“Cache”asusedhereinreferstothedrivebufferstoragespacewhen
it is used in “cache” operations. To select prefetch and cache features the host sends the Mode Select
commandwiththepropervaluesintheapplicablebytesinModePage08h*.Prefetchandcacheoperationare
independentfeaturesfromthestandpointthateachisenabledanddisabledindependentlyviatheModeSelect
command.However,inactualoperation the prefetch featureoverlaps cacheoperation somewhat asis noted
in sections 5.5.1 and 5.5.2.
AlldefaultcacheandprefetchModeparametervalues(ModePage08h)forstandardOEMversionsofthisdrive
family are given in Tables 11.3.2-1 through 11.3.2-4.
5.5.1 Cache operation
In general, 480 Kbytes of the 512 Kbytes of physical buffer space in the drive can be used as storage space
for cache operations. The buffer can be divided into logical segments (Mode Select Page 08h, byte 13) from
which data is read and to which data is written. The drive maintains a table of logical block disk medium
addressesofthedatastoredineachsegmentofthebuffer.Ifcacheoperationisenabled(RCDbit=0inMode
Page08h,byte2,bit0.SeeSCSIInterfaceProductManual*),datarequestedbythehostwithaReadcommand
isretrieved fromthe buffer(if it isthere), beforeany disc accessis initiated.If cacheoperationis notenabled,
thebuffer(stillsegmentedwithrequirednumberofsegments)isstillused,butonlyascircularbuffersegments
duringdiscmediumreadoperations(disregardingPrefetchoperationforthemoment).Thatis,thedrivedoes
notcheckinthebuffersegmentsfortherequestedreaddata,butgoesdirectlytothemediumtoretrieveit.The
retrieveddatamerelypassesthroughsomebuffersegmentonthewaytothehost.Onacache“miss”,alldata
transferstothehostareinaccordancewith“buffer-full”ratiorules.Onacache“hit”thedriveignoresthe“buffer-
full”rationrules.SeeexplanationsassociatedwithModepage02h(disconnect/reconnectcontrol)intheSCSI
Interface Product Manual*.
The following is a simplified description of a read operation with cache operation enabled:
Case A - A Read command is received and the first logical block (LB) is already in cache:
1. Drive transfers to the initiator the first LB requested plus all subsequent contiguous LB’s that are already
in the cache. This data may be in multiple segments.
2. WhentherequestedLBisreachedthatisnotinanycachesegment,thedrivefetchesitandanyremaining
requestedLB’s fromthe discand putsthem in asegment ofthe cache.The drive transfersthe remaining
requested LB’s from the cache to the host in accordance with the disconnect/reconnect specification
mentionedabove.
3. If the prefetch feature is enabled, refer to section 5.5.2 for operation from this point.
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*SCSI Interface Product Manual, 77738479.