
1.0 Specifications summary
1.1 Formatted capacity
The capacities specified here do not include spare sectors and cylinders.
The media contains one spare sector per cylinder and two spare cylin-
ders per drive. You can change this allocation using the Format Device
page (03
H
) discussed in Appendix C.3.
ST3285N ST3390N
Formatted capacity (Mbytes*) 248.62 344.31
Bytes per sector 512 512
Total sectors 485,601 672,480
ST3550N ST3655N
Formatted capacity (Mbytes*) 456.48 545.29
Bytes per sector 512 512
Total sectors 891,574 1,065,036
* One megabyte equals one million bytes.
1.2 Physical geometry
ST3285N ST3390N
Discs 2 2
Servo heads 1 1
Read/write heads 3 3
Cylinders 1,777 2,676
ST3550N ST3655N
Discs 3 3
Servo heads 1 1
Read/write heads 5 5
Cylinders 2,126 2,493
ST3655 Family SCSI Drives Product Manual, Rev. A 1
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