Seagate ST950814A, ST980829A, ST960812A, ST9402112A Drive specifications, Specification summary

2.0Drive 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 ST9120824A, ST9100825A, ST980829A, ST960812A, ST950814A, ST9402112A, and ST930218A model drives.

2.1Specification 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: 5,400 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 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)
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

Momentus 4200.2 Product Manual, Rev. C 3