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ST446452W,Elite 47 ST446452W
Product Manual
76 pgs689.31 Kb0

Seagate ST446452W,Elite 47 ST446452W Product Manual

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Elite 47 Disc Drive
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ST446452W
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Product Manual, Volume 1
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Elite 47 Disc Drive
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ST446452W
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Product Manual, Volume 1
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© 1998 Seagate Technology, Inc. All rights reser ved
Publication number: 83329280, Rev. A
February 1998
No part of this publication may be reproduced in any form without written permission from
Seagate Technology, Inc.
Printed in the United States of America
Revision status summary sheet
This manual is volume 1 of a two-volume document with the SCSI interface information in the volume 2
SCSI Interface Product Manual
, part number 77738479.
If you need SCSI interface information, order the volume 2
SCSI Interface Product Manual
, part numbe r
77738479.
Revision Date Writer/Engineer Sheets Affected
A 01/09/98 L. Newman/B. Rathe All
Elite 47 Product Manual, Rev. A v
Contents
1.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.0 Applicable standards and reference documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.1 Electromagnetic compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Electromagnetic compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.3 Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.0 General descr iption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Standard features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Media characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.5 Unformatted and formatted capacit ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.6 Programmable drive capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.7 Factory installed accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.8 Options (factory installed). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.9 Accessories (user installed). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.0 Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Internal drive characteristics (transparent to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 SCSI seek performance characteristics (visible to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.1 Access time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.2 Format command execution time (for ≥ 512-byte sectors). . . . . . . . . . . . . . . . . . . . 9
4.2.3 General performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.3 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.4 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5 Cache operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.5.2 Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.0 Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1.1 Environmental interference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1.2 Read errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1.3 Write errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1.4 Seek errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2 Reliability and service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 6
5.2.1 Mean time bet ween failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.2 Preve ntive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.3 Service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.4 Service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.5 Service tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.6 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2.7 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.1 AC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2 DC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2.1 Conduct ed noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.2.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.2.3 12 V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.3 Power dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.4 Environmental limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.4.1 Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.4.3 Effective altitude (sea level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
vi Elite 47 Product Manual, Rev. A
6.4.5 Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6.4.6 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6.4.7 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6.5 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
7.0 Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
7.1 Drive internal defects and errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
7.2 Drive error recovery procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
8.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
8.1 Drive ID/option select header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
8.1.1 Notes for Figure 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
8.2 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
8.3 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
8.3.1 Air flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
8.4 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
8.5 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 6
9.0 Interface requiremen ts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
9.1 General description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
9.2 SCSI interface messages supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
9.3 SCSI interface commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
9.3.1 Inquiry data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
9.3.2 Mode Sense data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
9.4 SCSI bus conditions and miscellaneous features supported . . . . . . . . . . . . . . . . . . . . . . . . .44
9.5 Synchronous data trans fer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.5.1 Synchro nous data transfer periods supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.5.2 REQ/ACK offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.6 Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.6.1 DC cable and connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.6.2 SCSI interface physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
9.6.3 SCSI interface cable requiremen ts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
9.6.4 Mating connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
9.7 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
9.7.1 Single-ended drivers /receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
9.8 Terminator requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
9.9 Terminator power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
9.10 Disc drive SCSI timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
10.0 Seagate technical support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Elite 47 Product Manual, Rev. A vii
List of Figures
Figure 1. Elite 47 disc drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Elite 47 family drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Typical Elite 47 drive +5 V and +12 V current profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 4. Location of PCBA components listed in Table 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 5. Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 6. Mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 7. Option select jumper connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 8. J4A connections for Activity, Fault, and Ready LED indicators . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 9. Suggested air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 10. Physical interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 11. SCSI daisy-ch ain interface cabling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 12. Non-shielded 68-pin SCSI device connect or . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 13. Single-ended transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Elite 47 Product Manual, Rev. A 1
1.0 Scope
This manual describes Seagate Technology®, Inc. Elite 47™ disc drives. Elite 47 drives support the small computer system interface (SCSI) as described in the ANSI SCSI, SCSI-2,
and SCSI-3 (Fast-20 or Ultra SCSI) interface specifications to the extent described in this manual. The
SCSI
Interface Product Manual
(part number 77738479) describes general SCSI interface characteristics of this and
other families of Seagate drives. From this point on in this product manual the reference to Eli te 47 models is referred to as “the drive” (unless
references to individual models are necessary).
Figure 1. Elite 47 disc drive
Elite 47 Product Manual, Rev. A 3
2.0 Applicable standards and reference documentation
The drive is a system peripheral developed to the highest standards of design and construction. The dr ive depends on its host equipment to provide adequ ate power and environment to achieve optimum performance and compliance with applicable i ndustry and government regulations. Special attention must be given in the areas of safety, power distr ibution, shieldin g, audible no ise cont rol, and temperature regulation. Also, the drive must be securely mounted to guarantee the specified performance characteristics.
2.1 Standards
The Elite 47 family complies with Seagate standards as noted in the appropr iate sections of this manual and the Seagate
SCSI Interface Product Manual
(volume 2), part number 77738479.
The Elite 47 disc drive is a UL recog nized component per UL1 950, CSA cert ified to CSA C22.2 No. 950-789, and VDE certified to VDE 0805 and EN 60950.
2.1.1 Electromagnetic compatibility
The drive, as delivered, is designed f or s ystem integr ation and installation into a suitable enclosure prior to use. As such, the drive is supplied as a su bassembly and is no t subject to S ubpar t B of Part 15 of t he FCC Ru les and Regulations nor the Radio Interference Regulations of the Canadian Department of Communications.
The physical design characteristics of the dr ive serve to m inimize radiation when i nstal led in an enc losure that provides reasonable shielding. As such, the drive is capable of meeting the Class B limits of the FCC Rules and Regulations of the Canadian Depar tment of Communications when proper ly packaged. However, it is the user’s responsibility to assure that the drive meets the appropriate EMI requiremen ts in their system. Shielded I/O cables may be required if the enclosure does not provide adeq uate shielding. If the I/O cables are external to the enclosure, shielded cables should be used, with the shields grounded both to the enclosure and to the host controller.
2.1.1.1 Electromagnetic susceptibility
As a component assem bly, the drive is not required to me et any suscep tibility perform ance requi rements. It is the responsibility of those integrating the dri ve within their systems to perform t hose t ests req uired a nd des i gn their system to ensure that equipm ent operating in the same system as the drive or external to the system does not adversely affect the perf ormance of the drive. S ee Section 5.1.1 and Table 1, DC power requirements.
2.2 Electromagnetic compliance
Seagate uses an independen t laboratory to confirm com pliance to the directives/standard(s) for CE Marking and C-Tick Marking. The drive 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 PowerPC microprocessors
• 3.5-inch floppy disc drive
• Keyboard
• Monitor/display
• Printer
• External modem
•Mouse Although the test system with this Seagate m odel com pli es to the direct ives/standard(s), we cannot guarantee
that all systems will comply. The computer manufacturer or system integrator shall confirm EMC compliance and provide CE Marking and C-Tick Marking for their product.
Electromagnetic compliance for the European Union
If this model has the CE Marking it complies with the European Union requirements of the Electromagnet ic Compatibility Directive 89/336/EEC of 03 M ay 198 9 as amended by Directive 92/31/EEC of 28 April 1992 a nd Directive 93/68/EEC of 22 July 1993.
4 Elite 47 Product Manual, Rev. A
Australian C-Ti ck
If this model has the C-Tick Marking it complies with the Australia/New Zealand Standard AS/NZS3548 1995 and meets the Electromagnetic Compatibility (EMC) Framework requirements of Australia’s Spectrum Man­agement Agency (SMA).
2.3 Reference documents
Elite 47 Installation Guide
Seagate P/N 83329290
SCSI Interface Product Manual
(Volume 2) Seagate P/N 77738479
ANSI small computer system interface (SCSI) document numbers:
X3.131-1994 SCSI-2
X3.253-1995 SCSI-3 Parallel Interface Package Test Specification Seagate P/N 30190-001 (under 100 lb.) Package Tes t Spe cification Seagate P/N 30191-001 (over 100 lb.) In case of conflict between this document and any referenced document, this document takes precedence.
Elite 47 Product Manual, Rev. A 5
3.0 General description
Elite 47 drives combine magnetoresistive (MR) heads, partial response/maximum likelihood (PRML) read channel electronics, embedded servo technology, and a SCSI-3 (Fast-20) interface to provide high perfor­mance, high capacity data storage for a variety of systems including engineering workstations, network serv­ers, mainframes, and supercomputers.
Fast-20 (also known as Ultra SCSI) is a negotiated transfer rate. This transfer rate will occur only if your host adapter also supports Fast-20 data transfer rates. This drive also operates at SCSI-1 and SCSI-2 data transfer rates for backward compatibility with non-Fast-20 capable SCSI host adapters.
This manual describes the Elite 47 model ST446452W. It has a 68-pin interface connector for a 16-bit data b us. The drive records and recovers data on 5.25-inch (133.4 mm) non-removeable discs. The drive supports the S mall Computer System Interface (SCSI) as describ ed in the ANSI SCSI-2 interface
specifications to the extent described in this manual (volume 1), which defi nes the product perform ance char­acteristics of the Elite 47 family of drives, and the
SCSI Interface Product Manual
(volume 2), par t number 77738479, which describes the general interface characteristics of this and other families of Seagate SCSI drives.
The drive’s interface supports multiple initiators, disconnect/reconnect, self-configuring host software, and automatic features that relieve the host from the necessity of knowing the physical characteristics of the targets (logical block addressing is used).
The head and disc assembly (HDA) is sealed at the factory. Air circulates within the HDA through a non­replaceable filter to maintain a contamination-free HDA environment.
Refer to Figure 2 for an exploded view of the drive. This exploded view is for information only—never disassem­ble the HDA and do not attempt to service items in the sealed enclosure (heads, med ia, actuator, etc.) as this requires special facilities. The drive contains no replaceable parts. Opening the HDA voids your warranty.
Elite 47 drives use a dedicated landing zone at the innermost radius of the media to eliminate the possibi lity of destroying or degrading data by landing in the data zone. The drive automatically goes to the landing zone when power is removed.
An automatic shipping lock prevents potential damage to the heads and discs that results from movement dur­ing shipping and handling. The shipping lock automati cally diseng ages when power is appli ed t o the drive and the head load process begins.
Elite 47 drives decode track 0 location data from the servo data embedded on each surface to eliminate mechanical transducer adjustments and related relia bilit y con ce rns.
A high-performance actuator assembly with a low-inertia, balanced, pa tented, straight-arm design provides excellent performance with minimal power dissipation.
6 Elite 47 Product Manual, Rev. A
Figure 2. Elite 47 family drive
3.1 Standard features
Elite 47 drives have the following standard features:
• Integrated SCSI controller
• Single-ended SCSI drivers and receivers
• 16-bit I/O data bus
• Asynchronous and synchronous data transfer protocols
• Firmware downloadable using the SCSI interface
• Programmable drive capacity
• Selectable sector size from 512 to 4,096 bytes per sector
• Programmable sector reallocation scheme
• Flawed sector reallocation at format time
• Programmable auto write and read reallocation
• Reallocation of defects on command (post format)
• Reed-Solomon error-correction code for header and data fields; can correct up to 64-bit error
• Sealed head and disc assembly (HDA)
• No preventative maintenance or adjustment required
• Dedicated head landing zone
• Embedded servo data rather than a separate servo data surface
• Self-diagnostics performed when power is applied to the drive
• 1:1 interleave
• Zone bit recording (ZBR)
• Vertical, horizontal, or top-down mounting
Elite 47 Product Manual, Rev. A 7
• Dynamic spindle brake
• Active IC terminators enabled by jumper
• 4,096 Kbyte data buffer . See Section 4.5
3.2 Media characteristics
The media used on the dri ve has a diamet er of approximately 5.25 i nc hes (134 mm). The aluminum subst rate is coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durabil­ity and environmental protection.
3.3 Performance
• Supports industry-standard Fast-20 SCSI interface (also called “Ultra SCSI”)
• Programmable multi-segmentable cache buffer
• 5,357 RPM spindle; average latency = 5.60 msec
• Command queuing of up to 64 commands
• Background processing of queue
• Supports start and stop commands (spindle stops spinning)
• Low audible noise for office environment
• Low power consumption
3.4 Reliability
• 800,000 hour MTBF
• LSI circuitry
• Balanced low mass rotary voice coil actuator
• Incorporates industr y -standa rd Self-Monitoring, Analysis and Repor ting Technology (S.M.A.R.T.)
• Incorporates Seek To Improve Reliability algorithm (STIR)
3.5 Unformatted a n d formatted capacities
Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes per sector. The following table shows standard OEM model capacities:
Notes.
[1] Standard OEM models a re formatted to have 512-byte sectors. Users having the necessar y equipment
may modify the data block size before issuing a f ormat 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,
part number 77738479.
[2] The number of data tracks per sparing zone and the number of alternate sectors (LBAs) per sparing zone
can be determined by using the Mode Sense command and reading Mode page 03h.
3.6 Programmable drive capacity
Using the Mode Select command, the drive can change its capacity to something less than maximum. See Table 5.2.1-13 in the
SCSI Interface Product Manual
, part number 77738479 . Refer to the Parameter list block descriptor number of blocks field. A value of zero in the number of blocks field indicat es that the dri ve will not change the capacity it is currently formatted to have. A number in the number of blocks field that is less than the maximum number o f LBAs chan ges the tot al drive capacity to the value in the block de scriptor num ber of blocks field. A value greater than the maximum number of LBAs is rounded down to the maximum capacity.
3.7 Factory installed accessories
The
Elite 47 Installation Guide
, part num ber 83329290, is shipped with each standard OE M drive (unless oth­erwise specified). A small bag of jumpers are also s hipped with the dr ive. Use these jumpers to configure the option headers. See Section 8.1.
SCSI terminators can be enabled or disabled.
Formatted [1] Unformatted
ST446452 47.0 Gbytes [2] 62.6 Gbytes
8 Elite 47 Product Manual, Rev. A
3.8 Options (factory installed)
All options that a cus t om er m ay request are i nc orporated during production or packaged at the manufacturing facility before shipping. Some of the options available are:
• The capacities shown in Section 3.5. You can order other capacities by selecting other sparing schemes and sector sizes.
• Single-unit shipping pack. The drive normally ships in bulk packaging to provide maximum protection against transit damage. Units shipped i ndividually require additional protection as provided by the si ngle-unit ship­ping pack. Specify this option if you are planning to ship single units to your customers.
•The
Elite 47 Installation Guide
, part number 83329290, is usually included wi th each standard OEM dr ive.
Additional copies may be ordered.
3.9 Accessories (user installed)
The following accessories are available.
• Single-unit shipping pack.
Elite 47 Product Manual, Rev. A 9
4.0 Performance characteristics
4.1 Internal drive characteristics (transparent to user)
[1] Rounded off values
4.2 SCSI seek performance characteristics (visible to user)
Refer to Section 9.10 and to the
SCSI Interface Product Manual
(part number 77738479 ) for additional timing
details.
4.2.1 Access time
4.2.2 Format command execution time (for ≥ 512-byte sectors)
4.2.3 General performance characteristi cs
Data buffer data transfer rate to/from disc media (one 512-byte sector) variable with zone/cylinder:
SCSI interface data transfer rate (asynchronous) [5]:
Maximum instantaneous (1-byte-wide transfer rate) 5. 0 Mbytes/sec [6] Maximum instantaneous (2-byte-wide transfer rate) 10. 0 Mbytes/sec [7]
Synchronous transfer rate for SCSI Fast-20 (Ultra SCSI):
16 bit data bus 5.0 to 40 Mbytes/sec
[] All notes for Sections 4.2 are listed at end of Section 4.2.3.
ST446452
Drive capacity 62.6 Gbytes (unformatted) [1] Read/write heads 28 Bytes/track 223,855 Bytes (average, unformatted) [1] Bytes/surface 2,238 Mbytes (unformatted) Tracks/surfa ce, total 9,996 Tracks (user accessible) Tracks/inch 8,334 TPI Peak bits/inch 178,847 BPI Internal data rate 125-185 Mbits/sec (variable with zone) Disc rotational speed 5,357 ± 0.5% r/min Average rotational latency 5.60 msec
Including controller overhead (without disconnect) [1] [4]
Drive level
Read Write
ms
Average Typical [3] 13.2 14.2 Single track Typical [3] 1.3 2.3 Full stroke Typical [3] 28.2 28.2
Maximum (with verify) 10.0 hours Maximum (no verify) 6.0 hours
Minimum sector interleave 1 to 1
Minimum [4] 125 Mbits/sec Maximum [4] 185 Mbits/sec
10 Elite 47 Product Manual, Rev. A
Synchronous transfer rate for fast SCSI-2:
16 bit data bus 5.0 to 40 Mbytes/sec
Sector sizes:
Default 512-byte data blocks
Variable in even-sector sizes 512 to 4,096 bytes per sector Read/write consecutive sectors on a track Yes Flaw reallocation performance impact :
For flaws reallocated at format time using spare
sectors per track reallocation scheme negligible
For flaws reallocated after format time using spare
sectors per cylinder reallocation scheme 11.1 msec (minimum)
22.2 msec (maximum) For flaws reallocated after format time using spare tracks per volume reallocation scheme 35 msec (typical)
Overhead time for head switch (512-byte sectors) in sequential mode 0.8 msec
Overhead time for one track cylinder switch in sequential mode 1.2 msec (typical)
Aver age rotational latency 5.60 msec
Notes for Sections 4.2.
[1] Execution time is 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 dr ive
orientation. When comparing specified access times, take care to distinguish between typical access times and maximum access times. Obtain the best comparison by conducting system benchmar k tests under identical conditions. Maximum times do not include error recovery.
[3] Typical acce ss times are meas ured under nom inal conditions of tempe rature, voltage, and horizontal ori-
entation as measured on a representative sample of drives. [4] Assumes no errors and no sector reallocations. [5] Rate measured from the start of the first sector transfer to or from the host. [6] Assumes system ability to support the 1-byte-wide transfer rate listed and no cable loss. [7] Assumes system ability to support the 2-byte-wide transfer rate listed and no cable loss.
Elite 47 Product Manual, Rev. A 11
4.3 S tar t/st op time
Disabling the Motor Start option causes the drive to become ready within 45 seconds after DC power is applied at nominal voltage. This means the motor starts as soon as power is applied. If a recoverable error condition is detected during the start sequence, the drive will execute a recovery procedure and may cause the time to become ready to exceed 45 seconds. During this time the drive responds to some commands over the SCSI interface. Stop time is less than 40 seconds from removal of DC power.
Enabling the Motor Start option causes the internal controller to accept the commands listed in the
SCSI Inter-
face Product Manual
(77738479) less than 3 secon ds after applying DC power. After receiving the Motor Star t command, the drive becomes ready for normal operations within 45 seconds (excluding an error recovery pro­cedure). The Motor Start command can also b e used t o comm and t he drive to stop the spindle in less than 40 seconds (see the Start/Stop com man d informat ion in the
SCSI Interface Product Manual).
There is no power control switch on the drive.
4.4 Prefetch/multi-segmented cache control
The drive provides prefetch (read look-ahead) and multi-segmented cache control algorithms that in many cases can enhance system performance. “Cache” as used herein refers to the drive buffer storage space when it is used in “cache” operat ions. To sele ct prefetch and cache features the hos t sends the Mo de Select com­mand with the proper values in the applicable bytes in Mode Page 08h (see
SCSI Interface Product Manual
). Prefetch and cache operation are in dependent features from the standpoin t that eac h is enabled and disabled independently via the Mode Select command. However, in actual operation the prefetch f eature o verlaps cache operation somewhat as is noted in Section 4.5.1 and 4.5.2.
All default cache and prefetch Mode parameter values (Mode Page 08h) for standard OEM versions of this drive family are given in Table 7.
4.5 Cache operation
Of the 4,096 Kbytes physical buffer space, approximately 3,442 Kbytes can be used as a cache. The cache can be divided into logical segments (M ode Select page 08h, byte 13) from which data is read and to wh ich data is written.
The drive keeps track of the logical block addresses of the data stored in each segment of the cache. If the cache is enabled (see RCD bit = 0 in Mode page 08h, byte 2, bit 0 in the
SCSI Interface Product Manual),
data requested by the host with a read command is retrieved from the cache, if possible, before any disc access is initiated. If cache operation is not enabled, the buffer (still segmented with required number of segments) is still used, but only as circular buffer segments during disc medium read operations (disregarding P refetch opera­tion for the moment). That is, the drive does not check in the buffer segments for the requested read data, but goes directly to the medium to retrieve it. The retrieved data merely passes through some buffer segment on the way to the host. On a cache “miss,” all data transfers to the host are in accordance with “buffer-full” ratio rules. On a cache “hit,” the drive ignores the “buffer-full” ratio rule s. See explanations a ssocia ted with Mode page 02h (disconnect/reconnect control) in the
SCSI Interface Product Manual
. The following is a simplified description of a read operation with cache operation enabled: Case A - Read command is received and the first logical block is already in the cache.
1. Drive transfers to the initiator the first logical block requested plus all subsequent contiguous logical blocks
that are already in the cache. This data may be in multiple segments.
2. When a requested logical block is reached that i s not in a ny segment , the drive fetches it and any remain-
ing requested logical block addresses from the disc and puts them in a segm ent of the cache. The dr ive transfers the remaining requested logical blocks from the cache to the initiator in accordance with the “buffer-full” ratio specification given in Mode Select Disconnect/Reconnect parameters, page 02h (see the
SCSI Interface Product Manual).
3. The drive prefetches additional logical blocks contiguous to those transferred in step 2 above and stores
them in the segme nt. The drive stops filling the segment when the maximum p refetch value has been transferred (see the
SCSI Interface Product Manual).
12 Elite 47 Product Manual, Rev. A
Case B - Read command is received and the first logical block address requested is not in any segment of the
cache.
1. The drive fetches the reques ted logical blocks from the disc and transfers them into a s egm ent, then from there to the initiator in accordance with the “buffer-full” ratio specification given in Mode Select Disconnect/ Reconnect parameters, page 02h (see the
SCSI Interface Product Manual)
.
2. The drive prefetches additional logical blocks contiguous to those transferred in Case A, step 2 above and stores th em in the segm ent. The drive s tops filling the segment wh en the maximum prefetch value has been transferred.
During a prefetch, the drive crosses a cylind er bound ary to fetch data only if the Dis continuity (DISC) bit is s et to 1 in bit 4 of byte 2 of the Mode Select parameters page 08h. Default is zero for bit 4 (see the
SCSI Interface
Product Manual).
Each buffer segment is actually a self-contained circular storage (wrap-around occurs), the length of which is an integer number of disc medium sectors. The wrap-around capability of the individual segments greatly enhances the buffer’s ov erall performance as a cache storage, allowing a wide range of user selectable config­urations, which includes their use in the prefetch operation (if enabled), even when cache operation is disabled (see Section 4.5.2). The number of segm ents may be selected using the Mode Select com mand, but the size cannot be directly selected. Size is selected only as a by-product of selecting the segment number specifica­tion. The size in Kbytes of each segment is not reported by the Mode Sense command page 08h, bytes 14 and
15. These bytes read 0xFF FF, rega rdless of the num ber of seg ments setting. If a size spec ification is se nt by
the host in a Mode S elect comm and (bytes 14 and 1 5) no n ew segment size is set up by the dr ive, and if the “STRICT” bit in Mode page 00h (byte 2, bit 1) is set to one, the drive responds as it does for any attempt to change unchangeable parameters (see
SCSI Interface Product Manual).
The dr ive support s operation of any integer number of segments from 1 to 16. Divide the 3,442 Kbytes in the buffer by the number of segments to calculate the segment size. The default is three segments.
4.5.1 Caching write data
When the WCE (Write Cache Enable) bit is enabled, the drive uses a dr ive buffer storage area where the data to be written to the drive is stored in one or more segments while the drive performs the Write command. The write cache uses the same buffer space and segmentation as the read cache. The buffer segmentation scheme is set up or changed independently, having nothing to do with whether or not read and write caching is enabled or disabled.
If a 10-byte CDB write command (2 Ah) is iss ued wi th the DPO (Dat a Page Out) bit set to one, no wri te data is cached but the cache segm ents are still checked and cleared (if nee ded) for any logical blocks that are being written.
When a write command is issued, the cache is first checked to see if any logical blocks that are to be written are already stored in the cache from a previous read or write command. If there are, the respective cache seg­ments are cleared. The new data is cached for subsequent read commands.
If the number of write data logical blocks exceeds the size of the segment being written into when the end of the segment is reached, the data is written into the beginning of the same cache segment, overwriting the data that was written there at the beginning of the operation. Howev er, the drive does not overwrite data that has not yet been written to the disc.
Table 7 shows Mode default settings for the drives. Note. The WC E bit is disabled by default on OEM drives. To enable the WCE bit, change Mode Sense Page
08h, byte 2, bit 2 to a value of 1.
4.5.2 Prefetch operation
If the Prefetch feature is enabled, data in contiguous logical blocks on the disc i mmediately beyond that which was requested by a read command can be retrieved and stored in the buffer for immediate transfer from the buffer to the host on subsequent read comman ds that request those logical blocks (this is true even if “cache” operation is disabled). Though the prefetch operation uses the buffer as a “cache,” finding the requested data in the buffer is a prefetch “hit,” not a “cache” operation “hit.” Prefetch is enabled using Mode Select page 08h, byte 12, bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch. Since data that is prefetched replaces data already in some buffer segment(s), the host can limit the amount of prefetch data to optimize
Elite 47 Product Manual, Rev. A 13
system performance. The max prefetch field (bytes 8 and 9) limits the am ount of prefetch. The drive does not use the prefetch “ceiling” field (byt e s 10 and 11).
During a prefetch operation, the drive crosses a cylinder bo undary to fetch more data only if the Di scontinuity (DISC) bit is set to one in bit 4 of byte 2 of Mode parameters page 08h.
Whenever prefetch (read look-ahead) is enabled (enabled by DRA = 0), it operates under the control of ARLA (Adaptive Read Look-Ahead). If the host uses software interleave, A RLA enables prefetch of contiguous blocks from the disk when it senses t hat a prefetch “hit” w ill l ikely occu r, even if two consecutive read operations were not for phy sically contiguous bloc ks of data (e .g. “software interleav e”). ARLA disables prefetch when it decides that a prefetch “hit ” w ill not likely o ccur. If the h ost is not using software int er leave, and if two sequenti al re ad operations are not for contiguous blocks of data, ARLA disables prefetch, but as long as sequential read oper­ations request contiguous blocks of data, ARLA keeps prefetch enabled.
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