Seagate ST9120821AB, ST98823AB manual Drive specifications, Specification summary, Specifications

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 ST9120821AB, ST9100824AB, ST98823AB, ST96812AB, and ST94813AB 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
Drive specification		ST9120821AB	ST9100824AB	ST98823AB	ST96812AB	ST94813AB
Formatted Gbytes (512 bytes/sector)*		120	100	80	60	40
Guaranteed sectors		234,441,648	195,371,568	156,301,488	117,210,240	78,140,160
Bytes per sector		512
Physical read/write heads		4	4	3	2	2
Discs		2	2	2	1	1
Cache (Mbytes)		8
Recording density,		778k
BPI (bits/inch typical)
Track density.		126k
TPI (tracks/inch typical)
Areal density (Gbits/inch2 max)		98.2
Spindle speed (RPM)		5,400
Internal data transfer rate OD		42
(Mbytes/sec max)
I/O data-transfer rate		100
(Mbytes/sec max)
ATA data-transfer		PIO modes 0–4
		Multiword DMA modes 0–2
modes supported
		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		1.0 (read), 1.5 (write)
(msec typical)
Average seek time (msec typical)		12.5

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