Seagate ST251,ST277R,ST251R Product Manual
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ST251/ST251 R/ST277R
Product Manual
February 3, 1987
36035-001, Revision A
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920 Disc Drive, Scotts Valley, CA 95066-4544, USA
Telephone: 408/438-6550. Telex: 176455 SEAGATE SCVL
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Copyright Notice
This manual and all the material contained in it are copyrighted with
all rights reserved. This manual may not be copied, in whole or in
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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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
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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 .
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ST251 /251R/277R Product Manual, Rev.A
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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
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ST251
/251R/277R Product Manual, Rev.A
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ST251 /251R/277R Product Manual, Rev.A
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