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Momentus 7200.1 PATA Product Manual, Rev. C
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
ST910021A. ST980825A, ST96023A and ST94015A 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 ST910021A ST980825A ST96023A ST94015A
Formatted Gbytes (512 bytes/sector) 100 80 60 40
Guaranteed sectors 195,371,568 156,301,488 117,210,240 78,140,160
Bytes per sector 512
Physical read/write heads 4 4 3 2
Discs 2 2 2 1
Cache (Mbytes) 8
Recording density, BPI (bits/inch max) 700,000
Track density. TPI (tracks/inch max) 114,000
Areal density (Bbits/inch
2
max) 81
Spindle speed (RPM) 7,200
Internal data transfer rate OD (Mbits/sec max) 539
Sustained data transfer rate OD (Mbytes/sec) 45.8
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 +/-.0078 inches)
Width 69.85 +/-0.25 mm (2.75 +/-0.0098 inches)
Length 100.2 +/-0.25 mm (3.945 +/-0.0098 inches)
Weight (typical) 115 grams (0.254 lb)
Average latency (msec) 4.2
Power-on to ready (typical) 4 seconds
Standby to ready (typical) 3 seconds
Startup current 5V (peak) 1.1 amps
Track-to-track seek time (msec typical) 1.5 (read), 2.0 (write)
Average seek, read (msec typical) 10.5
Average seek, write (msec typical) 12.5
Full-stroke seek (msec) 22 (typical); 28 (max)