Momentus 4200.2 Product Manual, Rev. C
3
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
ST9120824A, ST9100825A, ST980829A, ST960812A, ST950814A, ST9402112A, and ST930218A 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 for 120, 100, and 80 GB models
Drive specification ST9120824A ST9100825A ST980829A
Formatted Gbytes (512 bytes/sector)* 120 100 80
Guaranteed sectors 234,441,648 195,371,568 156,301,488
Bytes per sector 512
Physical read/write heads 4 4 3
Discs 2 2 2
Cache (Mbytes) 8
Recording density, BPI (bits/inch typical) 778k
Track density. TPI (tracks/inch typical 126k
Areal density (Gbits/inch2 max) 98.2
Spindle speed (RPM) 4,200 RPM-class performance (actual spin speed: 5,4 00 RPM)
Internal data transfer rate OD (Mbytes/sec max) 37
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 mo des 0–5
Height 9.5 +/–0.2 mm (0.374 +/–.008 inches)
Width 69.85 +/–0.25 mm (2.750 +/–0.010 inch es)
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)
Average seek time (msec typical) 12.5
Average seek, read (msec typical) 12.5
Average seek, write (msec typical) 14.5
Full-stroke seek (msec) 22 (typical); 24 (max)
Seek power (typical) 2.00 watts