Momentus 7200.2 SATA Product Manual, Rev. E
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 the
ST9200420ASG, ST9200420AS, ST9160823AS, ST9160823ASG, ST9120823AS, ST9100821AS,
ST980813AS and ST980813ASG models.

2.1 Specification summary tabl e

The specifications listed in this table are for quick reference. For details on specification measurement or defi-
nition, see the appropriate section of this manual.
Table 1: Drive specifications
Drive specification ST9200420ASG
ST9200420AS ST9160823AS
ST9160823ASG ST9120823AS ST9100821AS ST980813AS
ST980813ASG
Formatted Gbytes (512 bytes/sector)* 200 160 1 20 100 80
Guaranteed sectors 390,721,968 312,581,808 234,441,648 195,371,568 156,301,488
Bytes per sector 512
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Physical read/write heads 4 3 3 2
Discs 2 2 2 1
Recording density in BPI (bits/inch max) 1,014,000 853,000
Track density TPI (tracks/inch max) 162,600 155,000
Areal density (Gbits/inch2 max) 169.4 131
Spindle speed (RPM) 7,200
Internal transfer rate (Mbits/sec max) 850 711
Sustained transfer rate OD (Mbytes/sec) 69.5 59
I/O data transfer rate (Gb/s max) 3.0 (can also be configured for 1.5Gb/s operation)
ATA data-transfer modes supported SATA-1
PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–5
Cache buffer (Mbytes) 16 8
Height (max) 9.5 +/- 0.2 mm (0.374 +/- .0078 inches)
Width (max) 69.85 mm +/- 0.25 mm (2.75 +/- 0.00984 inches)
Length (max) 100.5 +/- 0.25 mm (3.957 +/- +/- 0.00984 inches)
Weight (max) 115 grams (0.254 lb)
Average latency (msec) 4.17 msec
Power-on to ready (typical) 4 seconds