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HP C2486Aj88Aj90A
3.5-inch SCSI-2 Disk Drives

Technical Reference Manual

Fli;- HEWLETT
~~ PACKARD

HP Part No. xxxx-xxxx
Printed in U.S.A. September 1992

Edition 1
DRAFT 1/18/93 09:58
Printing History
This manual will be revised without notice in order to reflect the latest version of the product
it describes. New editions are complete revisions of the manual. The dates on the title page
change only when a new edition is published.
Many product updates do not require manual changes and, conversely, manual corrections
may be done without accompanying product changes.
Edition 1 ................................................................. September 1992

DRAFT iii
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Contents

1. Product Specifications
Product Description 1-1
Key Features . . 1-1
Interface Options . 1-2
Specials . . . . . 1-2
Related Documentation 1-2
Disk Drive Capacities . 1-4
Operating Specifications 1-6
DC Power Characteristics 1-9
Environmental Requirements 1-10

2. Product Installation
Introduction . . . . . . . . . . . 2-1
Handling Guidelines . . . . . . . . 2-1
Protection From Mechanical Shock 2-1
Protection from Electrostatic Discharge (ESD) 2-1
Unpacking the Disk Drive . . . . . 2-2
Inspecting the Shipping Container 2-2
Inspecting the Disk Drive 2-2
Recording the Serial Number 2-2
Disk Drive Returns . . . . . 2-2
Return Shipment Addresses 2-2
Vendor Purchases . . . . 2-2
Hewlett- Packard Direct Purchases . 2-2
Re-Packing For Shipment 2-3
Mounting Information . . . . . . . . 2-5
Safety /Regulatory Compliance . . . 2-5
Chassis Dimensions and Mounting Screw Locations 2-5
Physical Mounting 2-5
Airflow Requirements . . . . . . . . 2-5
Front Panel LED Indicator . . .. . . . . 2-6
Address and Configuration Pin-Set Set-ups 2-6
Drive To Interface Connections . . . . 2-8
Interface Connectors and Cables 2-9
Connector Dimensions and Locations 2-9
SCSI Connector . . . . . . . 2-9
DC Power Connector 2-9
Mating Connector Requirements 2-9
Cabling Requirements 2-10
Single-ended Cable 2-10
Differential Cable . 2-10

DRAFT Contents-1
1/18/93 09:58
3. Product Features
Introduction 3-1
Functional Description . 3-1
Disk Format 3-1
Sector Format 3-1
Addressing Structure 3-1
Error Correction Code 3-1
Cyclic Redundancy Check (CRC) .- 3-2
Track Sparing 3-2
Look Ahead Reads 3-2
Head Alignments 3-3
Head Alignment States 3-3
Head Alignment Modes 3-3
Typical Head Alignment Times 3-4
Command Queuing 3-4
Error Recovery 3-6
Synchronized Spindle Operation 3-6
Assembly Descriptions . 3-6
Head/Disk Assembly 3-6
Disks 3-6
Heads 3-7
Actuator and Latch Assembly 3-7
Head Interface Electronics 3-7
Atmospheric Controls 3-7
Vibration Isolators 3-7
Spindle Assembly 3-7
Block Diagram 3-8
SCSI Interface 3-8
RAM Buffer 3-8
Disk Controller 3-8
Data Encoder/Decoder 3-8
Microcontroller 3-8
Servo Processor . 3-9
Data Head Interface 3-9
Actuator Driver 3-9
Servo Timing . 3-9
Spindle Motor Driver 3-9
Power Distribution 3-9

4. SCSI Interface
Introduction 4-1
Supported Functions 4-1
Status Byte 4-6
SCSI Message Support . 4-7
Target Error Conditions 4-8
Message Out Phase Parity Error 4-8
Command or Data Out Phase Parity Error 4-8
lllegal Messages . 4-8
Reselection Timeout . 4-8

Contents-2 DRAFT
1/18/93 09:58
A. SCSI Command Descriptions
Command Descriptions A-I
Command Details . A-I
Control Byte A-2
Change Definition. A-6
Format Unit A-7
Inquiry A-ll
Mode Select, -Mode Sense A-15
Read A-31
Read Buffer A-32
Read Capacity A-33
Read Defect Data . A-34
Read Long A-36
Reassign Blocks . A-37
Receive Diagnostic Results A-39
Release A-41
Request Sense A-42
Reserve A-48
Rezero Unit A-49
Seek. A-50
Send Diagnostic A-51
Start/Stop Unit A-53
Synchronize Cache A-54
Test Unit Ready A-55
Verify A-56
Write A-57
Write And Verify A-59
Write Buffer A-60
Write Long. A-62
Write Same A-63

B. Vendor Unique Command Descriptions
Command Descriptions B-1
Access Log. B-2
Change SCSI ID B-7
Change Wide SCSI ID B-8
Execute Data. B-9
Interface Control B-I0
Manage Primary B-ll
Media Test. B-16
Read Full B-18
Read Headers B-20
Reformat Track . B-21
Write Full B-22

DRAFT Contents-3
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C. Vendor Unique Status Codes

D. Reference

E. Narrow, Single-Ended Drive Configurations
Terminator Power Source Options. . . . . E-4

Index

Contents-4 DRAFT
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Figures

1-1. Disk Drive Major Components 1-3
2-1. Single-Unit Packaging . . . . 2-3
2-2. Ten-Unit Packaging . . . . . 2-4
3-1. Disk Drive Addressing Structure 3-10
3-2. Formatted Physical Sector Allocation 3-14
3-3. Disk Drive Block Diagram . . . . . 3-15
E-1. Narrow, Single-Ended: Disk Drive Dimensions and Mounting Locations E-l
E-2. Narrow, Single-Ended: Interface, Address and Option Connectors E-2
E-3. Narrow, Single-Ended: Connector Dimensions . . . . E-5
E-4. Narrow, Single-Ended: Temperature Measuring Points. . . . . E-6

Tables
1-1. HP C2486A/88A/90A SCSI Disk Drive Capacities 1-4
1-2. HP C2486A/88A/90A Operating Specifications . . 1-6
1-3. HP C2486A/88A/90A DC Power Characteristics . 1-9
1-4. HP C2486A/88A/90A Environmental Requirements 1-10
2-1. Address/Configuration Pin-Set Information Locations 2-6
2-2. Address/Configuration Option Descriptions 2-7
2-3. Recommended Mating Connectors . . . . . . . 2-9
3-1. C2486A/88A/90A Cylinder Allocation. . . . . . 3-11
4-1. HP C2486A/88A/90A Supported SCSI Commands 4-4
A-I. Supported SCSI-2 Commands . . . . A-3
B-1. Vendor Unique Commands . . . . . . B-1
C-1. Vendor Unique DERROR Status Codes C-l
D-1. Reference Appendix Contents . . . . D-l
E-l. Narrow, Single-Ended: Address and Option Connector Configurations E-3
E-2. Narrow, Single-Ended: On-Board Terminator Power (TermPwr) Sources E-4
E-3. Narrow, Single-Ended: SCSI Connector Pin Assignments . . . . . . E-5

DRAFT Contents-5
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1
Product Specifications

Product Description
The HP C2486A/88A/90A single-ended and differential disk drives are reliable, low cost,
high capacity, high performance, random access mass storage devices. Each product utilizes
sputtered thin-film 3.5-inch (95 mm) disks as storage media. The disk drive electrical interface
is compatible with the industry standard Small Computer System Interface (SCSI-2). Figure
1-1 shows the major components of the disk drive.
These drives incorporate an advanced Digital Signal Processor (DSP) hybrid servo design that
provides the flexibility and performance of a dedicated servo system and the dynamic head
alignment of an embedded servo system. High capacity and fast average transfer rates are
achieved with Multiple Zone Recording.
The product specifications are listed in the following tables:
Capacities ............................................ .- .......................... Table 1-1
Operating Specifications ......................................................... Table 1-2
DC Power Characteristics ........................................................ Table 1-3
Environmental Requirements .................................................... Table 1-4

Key Features