Seagate ST251 - Table of Contents

CONTENTS
1.0 SPECIFICATION SUMMARY ...................... 1-1
1.1 Drive Capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1.1 Unformatted Capacity ...................... 1-1
1.1.2 Formatted Capacity . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1.3 Physical Organization. . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 Access Time Definition and Timing. . . . . . . . . . . . . . . . . 1-2
1.3 Step Pulse Period and Seek Method. . . . . . . . . . . . . . . . 1-2
1.4 Functional Specifications. . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.S Recording Methods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.6 Physical Specifications .......................... 1-3
1.7 Reliability Specifications. . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.7.1 Read Error Rates . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.7.1.1 Bit
Jitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.7.2 Media
Defects. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.7.2.1 ST2S1 .............................. 1-S
1.7.2.2 ST2S1R ....... , . . . . . . . . . . . . . . . . . . . . . 1-S
1.7.2.3 ST277R . .. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-S
1.8 Envi ronmental Specifications ..................... 1-S
1.8.1 Ambient Temperature ...................... 1-S
1.8.1.1 ST251 .............................. 1-S
1.8.1.2 ST251R/277R ........................ 1-5
1.8.2 Temperature Gradient . . . . . . . . . . . . . . . . . . . . . . 1-5
1.8.3 Relative
Humidity. . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
1.8.4 Altitude Limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
1.8.S Shock and Vibration Specifications. . . . . . . . . . . . 1-6
1.8.S.10peratingShock ........... .......... 1-6
1.8.S.2 Operating Vibration. . . . . . . . . . . . . . . . . . . 1-6
1.8.5.3 Nonoperating Shock
.................. 1-7
1.8.5.4 Nonoperating Vibration . . . . . . . . . . . . . . . . 1-7
1.9 DC Power Specifications. . . . . . . . . . . . . . . . . . . . . . . . . 1-8
1.9.1 Input Noise Ripple and Frequency ............ 1-10
1.9.2 ULlCSA Certification. . . . . . . . . . . . . . . . . . . . . . . 1-10
1.10
FCC Certification .............................. 1-10
1.11 Mounting Requirements. . . . . . . . . . . . . . . . . . . . . . . . . 1-11
1.11.1 Shock Mounti ng Recommendations .......... 1-11
ST251 /251 RI277R Product Manual, Rev.A iii