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Momentus 5400.2 PATA Product Manual, Rev. B
3
2.0 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
ST9120821A, ST9100824A, ST98823A, ST96812A, ST94813A and ST93811A model drives.
2.1 Specification summary
The specifications listed in this table are for quick reference. For details on specification measurement or
definition, see the appropriate section of this manual.
Table 1: Specifications
Drive specification ST9120821A ST9100824A ST98823A ST96812A ST94813A ST93811A
Formatted Gbytes (512 bytes/sec-
tor)
120 100 80 60 40 30
Guaranteed sectors 234,441,648 195,371,568 156,301,488 117,210,240 78,140,160 58,605,120
Bytes per sector 512
Physical read/write heads 4 4 3 2 2 1
Discs 2 2 2 1 1 1
Cache (Mbytes) 8
Recording density,
BPI (bits/inch typical)
778k
Track density.
TPI (tracks/inch typical)
126k
Areal density (Gbits/inch
2
max) 98.2
Spindle speed (RPM) 5,400
Internal data transfer rate OD
(Mbytes/sec max)
42
I/O data-transfer rate
(Mbytes/sec max)
100
ATA data-transfer
modes supported
PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–5
Height 9.5 +/-0.2 mm (0.374 +/-.008 inches)
Width 69.85 +/-0.25 mm (2.750 +/-0.010 inches)
Length 100.2 +/-0.25 mm (3.945 +/-0.010 inches)
Weight (typical) 100 grams (0.22 lb)
Average latency (msec) 5.6
Power-on to ready (sec typical) 3.5
Standby to ready (sec typical) 3.0
Startup current 5V (typical) 1.0 amps
Track-to-track seek time
(msec typical)
1.0 (read), 1.5 (write)