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U4 Family Product Manual, Rev. D 5
1.0 Drive specifications
Unless otherwise noted, all specifications are measured under ambient
conditions, at 25°C, and nominal power. For convenience, the phrases
the drive
and
this drive
are used throughout this manual to indicate the
U4 ST38421A, ST36421A, ST34311A and the ST32112A.
1.1 Formatted capacity
1.1.1 Default logical geometry
LBA Mode
When addressing either drive in LBA mode, all blocks (sectors) are
consecutively numbered from 0 to
n–1,
where
n
is
the number of
guaranteed sectors as defined above
.
1.2 Physical organization
Drive Model
Guaranteed Mbytes
(1 Mbyte = 10
6
bytes)
Guaranteed
sectors
Bytes per
sector
ST38421A 8,440 16,498,944 512
ST36421A 6,448 12,596,850 512
ST34311A 4,320 8,452,080 512
ST32112A 2,160 4,225,536 512
CHS Mode Cylinders Read/Write heads Sectors per track
ST38421A 16,368 16 63
ST36421A 13,330 15 63
ST34311A 8,944 15 63
ST32112A 4,192 16 63
Drive Model Read/Write heads (MR) Number of discs
ST38421A
42
ST36421A 3 2
ST34311A 2 1
ST32112A 1 1