Seagate ST251 User manual

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ST251/ST251 R/ST277R

Product Manual

February 3, 1987

36035-001, Revision A

~920 Disc Drive, Scotts Valley, CA 95066-4544, USA

Telephone: 408/438-6550. Telex: 176455 SEAGATE SCVL

d5» Seagate

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This manual and all the material contained in it are copyrighted with

part, witholJt written consent of Seagate Technology.

Seagate reserves the right to change, without notice, the specifications

contained in this manual.

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ii ST251/251 R/277R Product Manual, Rev.A

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CONTENTS

1.0 SPECIFICATION SUMMARY .

1.1 Drive Capacity .

1.1.1 Unformatted Capacity .

1.1.2 Formatted Capacity .

1.1.3 Physical Organization .

1.2 Access Time Definition and Timing .

1.3 Step Pulse Period and Seek Method .

1.4 Functional Specifications .

1.5 Recording Methods .

1.6 Physical Specifications .

1.7 Reliability Specifications .

1.7.1 Read Error Rates .

1.7.1.1 Bit Jitter .

1.7.2 Media Defects .

1.7.2.1 ST251 .

1.7.2.2ST251R .

1.7.2.3 ST277R .

1.8 Environmental Specifications .

1.8.1 Ambient Temperature .

1.8.1.1 ST251 .

1.8.1.2 ST251R/277R .

1.8.2 Temperature Gradient .

1.8.3 Relative Humidity .

1.8.4 Altitude Limits .

1.8.5 Shock and Vibration Specifications .

1.8.5.1 Operating Shock .

1.8.5.2 Operating Vibration .

1.8.5.3 Nonoperating Shock .

1.8.5.4 Nonoperating Vibration .

1.9 DC Power Specifications .

1.9.1 Input Noise Ripple and Frequency .

1.9.2 UL/CSA Certification .

1.10 FCC Certification .

1.11 Mounting Requirements .

1.11.1 Shock Mounting Recommendations .

ST251 /251R/277R Product Manual, Rev.A

1-1

1-2

1-3

1-4

1-5

1-6

1-7

1-8

1-10

1-11

iii

1.11.2 Handling Precautions .

1.11.3 Shipping Zone .

1.12 Auto-Truncation .

1.13 Typical Drive Timing .

2.0 DRIVE CONFIGURATION .

2.1 Drive Configuration Shunt J7 .

2.2 Drive Select .

2.2.1 Daisy-Chain/Radial Drive Configurations .

2.3 Write Fault Latch Options: JP1 and J7 .

2.4 DC-Unsafe Option: JP2 .

2.5 Precompensation .

2.6 Life-Test .

APPENDIX A. MFM/RLL FORMAT EXAMPLE .

1-13

1-131-131-14

2-1 (

2-1 ~

2-2

!]I

2-2 2-22-32-32-3

A-1

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iv ST251 /251R/277R Product Manual, Rev.A

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(..

1) (LIST OF IllUSTRATIONS

Figure 1. Typical +12 VDC Start-Up Current Profile 1-9

Figure 2. Typical Power-On Sequence 1-9

Figure 3. Drive Mounting Dimensions 1-12

Figure 4. Read/Write Timing 1-14

Figure 5. Buffered-Seek Timing 1-15

Figure 6. Auto-Truncation Timing 1-15

Figure 7. Host/Drive Interface Connectors 2-1

2-4 ST251 /251R/277R Product Manual, Rev.A

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ST251 /251R/277R Product Manual, Rev.A v

(/1'

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The latched operation has two configurations which are provided at

the J7 shunt, pins 5-6.

1. No jumper at J7: The Write Fault signal can only be cleared by a

power on/off cycle. Use of this option in conjuction with the DC-

Unsafe option is not recommended.

2. Pins 5-6 shorted at J7: The Write Fault signal can be cleared by

de-selecting the drive. When the drive is deselected, and the fault

condition is corrected, the Write Fault signal will be false.

2.4 DC-UNSAFE OPTION: JP2

JP2 has two jumper pads, and when a jumper is installed, a DC-unsafe

condition will cause a Write Fault to be sent to the interface. Use Fig-

ure 7on page 2-1 to locate JP2.

2.5 PRECOMPENSATION

The ST251/251R/277R do not require precompensation.

2.6 LIFE-TEST

This is a test function used during the manufacturing process and is

not recommended for field use. When pins 7-8 of J7 are shorted, the

stepper motor will continuously seek between Track 0 and the maxi-

mum cylinder and will ignore control signals sent via the interface.

vi ST251 /251R/277R Product Manual, Rev.A

ST251 /251R/277R Product Manual, Rev.A 2-3

2.2 DRIVE SELECT

The Drive Select line enables the controller to select and address the

drive. Control cable interface options may use either a daisy-chain or

radial configuration.

Pins 15-16 shorted enables Drive Select 1

Pins 13-14 shorted enables Drive Select 2

Pins 11-12 shorted enables Drive Select 3

Pins 9-10 shorted enables Drive Select 4

2.2.1 DAISY-CHAIN/RADIAL DRIVE CONFIGURATIONS

The ST251/251R/277R can be configured in either a daisy-chain or

radial mode. The radial option is enabled by shorting pins 1 and 2 at

J7. The resistor termination pack must remain installed on any radially

configured drive.

In a daisy-chain configuration, the last drive in a chain must have the

resistor termination pack installed.

2.3 WRITE FAULT LATCH OPTIONS: JP1 AND J7

These options allow the user to configure the Write Fault reset to spe-

cific system requirements.

JP1 has three jumper pads, and is located adjacent to the 34-pin J1

connector. Figure 7on page 2-1 illustrates JP1 and indicates pin-1. J7

is located midway between the PCB edge-connectors (see "2.1 Drive

Configuration Shunt J7" on page 2-1).

STANDARD: 1 and 2 jumpered on JP1

Write Fault will be cleared when Write Gate is false. A Write Fault will

only occur when Write Gate is true.

LATCHED: 2 and 3 jumpered on JP1

This option will maintain Write Fault true after Write Gate goes false

and is recommended for controllers that do not edge-detect Write Fault.

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INTRODUCTION

This manual supports the ST251/251R/277R disc drives. It supercedes

and replaces the ST251 Product Manual, 36016-001, Rev. B.

2-2 ST251/251R/277R Product Manual, Rev.A ST251/251R/277R Product Manual, Rev.A vii

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2.0 DRIVE CONFIGURATION

The ST251/251R/277R may be configured for specific system require-

ments.

2.1 DRIVE CONFIGURATION SHUNT J7

J7 is a 16-pin right-angle shunt located midway between the J1 and J2

connectors. Use the provided shorting block(s) to enable the Drive

Select line and any options. Figure 7 illustrates J7 and indicates pin 1.

FIGURE 7: Host/Drive Interface Connectors

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DC power and

Pin Connector Assignments

Ir8008il

PIN POWER

+12 VOLTS

2+12 VOLTS RETURN

3+5 VOLTS RETURN

4+5 VOLTS

808000(0)

R~a~wq:X ~ ~~ r

rIF<Jult Test

Reserved

J7-16 PIN CONNECTOR

Shown with drive configured as DS-1

viii ST251 /251 R/277R Product Manual, Rev.A ST251 /251R/277R Product Manual, Rev.A 2-1

1-16 ST251 /251 R/277R Product Manual; Rev.A ST251 /251 R/277R Product Manual, Rev.A 1-1

1.2 ACCESS TIME DEFINITION AND TIMING FIGURE 5: Buffered-Seek Timing

1.3 STEP PULSE PERIOD AND SEEK METHOD

Access time is defined as the time from the leading edge of the first

step pulse received to Seek Complete (including settling). All seek

times are true statistical averages and are calculated with a step pulse

period of 10 jJsec. at nominal power and temperature.

- DIRECTION IN

-1 ~ 100 nsec. min.

-STEP

-1 ~ r-, 3 ~sec. min.

100 nsec. typo 200 ~sec. max.

. .

. ,

- SEEK COMPLETE : I L

~DON'T CARE~A STABLE ~DON'T CARE~

2~sec. min.

~ L1 0 ~sec. max.

100 nsec min. _11_ -I ~

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8 msec. max.

40 msec. max.

95 msec, max,

8.33 msec.

Track-to-Track:

Average:

Full-Stroke:

Average Latency:

- DRIVE SELECT I : I

I.• 40 msec. avg. ~I

95 msec. max.

The step signal is a 2jJsec. minimum width pulse which initiates read/

write head motion. The step pulse period determines the access

method. The number of pulses determines the seek length. The step

pulse period must be between 3jJsec. and 200jJsec.

Step pulses may be lost at periods greater than 200jJsec. For additional

information on step pulses and seek methods consult the Seagate

ST412 Interface Manual, (

100 nsec. min-1 ~ 100 nsec. min-1 ~

FIGURE 6: Auto- Truncation Timing

-TRACK eJ

:. Excessive Step Pulses Recognized

:rr. _

: )) 1 --

·11

- SEEK

COMPLETE

9 msec. typo I •• ~I

:;;_r I _

((I•• 13 sec. max. ~I

1-2 ST251/251R/277R Product Manual, Rev.A ST251/251R/277R Product Manual, Rev.A 1-15

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