2 U4 Family Product Manual, Rev. D

Specification summary table

The specifications listed in this table are for quick reference. For de tails

on specification measurement or definition, see t he appropriate section

of this manual.

Drive Specification ST32112A ST34311A ST36421A ST38421A
Guaranteed Mbytes
(×106 bytes)
2,160 4,320 6,448 8,440
Guaranteed sectors 4,225,536 8,452,080 12,596,850 16,498,944
Bytes per sector 512
Default sectors per track 63
Default read/write heads 16 15 15 16
Default cylinders 4,192 8,944 13,330 16,368
Physical read/write
heads 1 2 3 4
Discs 1 1 2 2
Recording density
BPI (bits/inch max) 241,000
Track density
TPI (tracks/inch) 13,100
Areal density
(Mbits/inch2 max) 3,179
Spindle speed (RPM) 5,400
Internal data-transfer
rate (Mbits/sec max)
206
I/O data-transfer rate
(Mbytes/sec max)
66.6
AT A data-trans fer modes
supported PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–4
Cache buffer (Kbytes) 256
Height (mm max) 26.1
Width (mm max) 102
Length (mm max) 147.0
Weight (typical) 580 grams (1.2 lb)