Seagate ST251N Product Manual Download Page 3 | Manualshive

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Summary of Contents for ST251N

Page 1: ...ST251N ST277N PRODUCT MANUAL 5 Seagate...

Page 2: ...ST251 N ST277N Product Manual March 6 1987 36034 001 Revision B 920 Disc Drive Scotts Valley CA 95066 4544 USA Telephone 408 438 6550 e Telex 176455 SEAGATE SCVL 659Seagate...

Page 3: ...s manual may not be copied in whole or in part without written consent of Seagate Technology Seagate reserves the right to change without notice the specifications contained in this manual IBM PC XT A...

Page 4: ...n Specifications 1 4 1 8 1 Operating Shock 1 4 1 8 2 Operating Vibration 1 4 1 8 3 Nonoperating Shock 1 4 1 8 4 Nonoperating Vibration 1 5 1 9 DC Power Specifications 1 5 1 9 1 Input Noise Ripple and...

Page 5: ...mat 2 4 2 5 1 Formatting and Defect Management 2 4 2 5 2 Record Interleave 2 4 2 6 Diagnostics 2 4 2 7 Incoming Inspection 2 5 2 7 1 Enabling the Offline Selftest Routines 2 6 iv ST251N 277N Product M...

Page 6: ...rrent Profile 1 6 Figure 2 Mounting Dimensions 1 8 Figure 3 Host Drive Interface Connectors 1 10 Figure 4 Nonshielded Cable Connector 1 12 Figure 5 50 Pin SCSI Connector Pin Assignments 1 12 Figure 6...

Page 7: ...vi ST251N 277N Product Manual Rev B...

Page 8: ...2 for self configuring software Seagate reliability is a built in feature Our manufacturing facilities are designed and located exclusively for the high volume production and testing of disc drives O...

Page 9: ...viii ST251Nl277N Product Manual Rev B...

Page 10: ...Bytes per Cylinder 52 224 Bytes per Track 13 312 Bytes per Sector 1 024 1 1 2 DATA ORGANIZATION Guaranteed Sectors Sectors per Cylinder Sectors per Track 41 718 51 13 ST251N 277N Product Manual Rev B...

Page 11: ...rack to Track Average Full Stroke Average Latency 8 msec max 40 msec max 95 msec max 8 33 msec 1 4 FUNCTIONAL SPECIFICATIONS Tracks Cylinders Read Write Heads Discs Rotational Speed Recording Method R...

Page 12: ...ot Required MTTR 30 minutes Component Design Life 5 years 1 7 ENVIRONMENTAL SPECIFICATIONS 1 7 1 AMBIENT TEMPERATURE Operating Nonoperating 10 C to 45 C 50 F to 113 F 40 C to 60 C 40 F to 140 F 1 7 2...

Page 13: ...positioned in the shipping zone 1 8 1 OPERATING SHOCK Maximum permitted shock without incurring physical damage or deg radation in performance 10 G s 1 8 2 OPERATING VIBRATION Maximum permitted vibrat...

Page 14: ...ER SPECIFICATIONS Power may be applied or removed in any sequence without loss of data or damage to the drive Typical power specifications assume nominal voltages applied 25 C ambient temperature sea...

Page 15: ...ent resistive loads 12 VDC 5 VDC 16 0 50 The maximum permitted noise frequency is 20 MHz on both the 12 VDC and 5 VDC lines FIGURE 1 Typical RMS Start up Current Profile These measurements are at nomi...

Page 16: ...h the spindle motor down or on either side The drive should not be tilted front to back in any position by more than 5 For optimum performance the drive should be formatted in the same orientation as...

Page 17: ...5 r 5 875 010 149 221 25 5 50 03 139 7 76 0 Dimensions are in inches mm Note Mounting Holes 4 on bottom 4 on each side 6 32 UNC 28 12X I 17 max 146 6 r The mounting screws must not extend inside the m...

Page 18: ...inch should be allowed around the en tire perimeter of the drive to allow for cooling airflow and mechanical movement during shock or vibration 1 10 2 HANDLING AND STATIC DISCHARGE PRECAUTIONS After u...

Page 19: ...LL THE P JUMPER TO ENABLE PARITY __ _g_I_ SCSI ID O Pin 1 2 3 4 Power 12 Volts 12 Volts Return 5 Volts Return 5 Volts 8 PIN SCSI ID AND w SCSI ID I w SCSI ID J3 DC POWER 50 PIN SCSI CONNECTOR PARITY J...

Page 20: ...90 0 is preferred for shielded cables To minimize discontinuities and signal reflections it is desirable to minimize the use of cables of different impedances in the same bus 1 11 2 CONNECTOR REQUIRE...

Page 21: ...mm FIGURE 5 50 Pin SCSI Connector Pin Assignments Signal Pin Num Signal Pin Num 08 0 2 Ground 08 1 4 Ground 08 2 6 ATN 08 3 8 Ground 08 4 10 8SY 08 5 12 ACK 08 6 14 RST 08 7 16 MSG D8 P 18 SEL Ground...

Page 22: ...on packs installed Signals driven by the ST251 N 277N have the following output charac teristics when measured at the drive connector Signal assertion o o voe to 0 4 voe Minimum driver output capabili...

Page 23: ...1 14 ST251Nl277N Product Manual Rev B...

Page 24: ...ible and up to seven SCSI devices Refer to the Seagate ST01 Host Adaptor Product Manual for detailed product definition and specifications 2 1 SCSI INTERFACE The embedded controller supports the SCSI...

Page 25: ...length Record interleave Enable disable error recovery Enabling disabling reporting of recovered error status Enabling disabling of reporting usage and error counter overflow 2 2 1 SCSI BUS ADDRESS Th...

Page 26: ...H Read Capacity 28H Read 2AH Write 2BH Seek 2FH Verify 37H Read Defect Data 3BH Write Buffer 3CH Read Buffer ESH Read Long E6H Write Long 2 4 ERROR RECOVERY The controller provides error recovery rout...

Page 27: ...Format using a combined list of previously defined defects manu facturer s list plus user defined list Format with previously defined list plus additional user defined de fects Format with manufactur...

Page 28: ...and an ad ditional sense code of 35H Spindle Speed Test If the drive is unable to reach and maintain correct spindle speed six flashes will be returned with an additional sense code of 36H Read Recor...

Page 29: ...ror Part One All sectors in the user data area are read starting with logical block zero Part Two This is a butterfly seek read test Starting at the center of the user data tracks the unit will seek o...

Page 30: ...Sejlfgate Publication 36034 001 Revision B 920 Disc Drive Scotts Valley California 95066 4544 USA...

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