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Momentus 7200.3 SATA 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 the
ST9320421AS, ST9320421ASG, ST9250421AS, ST9250421ASG, ST9200421AS, ST9200423ASG,
ST9160411AS, ST9160411ASG, ST9120411AS, ST9120411ASG, ST980411AS and ST980411ASG models.
2.1 Specification summary table
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
ST9320421AS
ST9320421ASG
ST9250421AS
ST9250421ASG
ST9200421AS
ST9200423ASG
ST9160411AS
ST9160411ASG
ST9120411AS
ST9120411ASG
ST980411AS
ST980411ASG
Formatted Gbytes
(512 bytes/sector)*
320 250 200 160 120 80
Guaranteed sectors 625,142,448 488,397,168 390,721,968 312,581,808 234,441,648 156,301,488
Bytes per sector 512
Physical read/write heads 4 3 3 2 2 1
Discs 222111
Cache (Mbytes) 16
Recording density in BPI
(bits/inch max)
1,334k
Track density TPI
(tracks/inch max)
190k
Areal density
(Gbits/inch
2
max)
253
Spindle speed (RPM) 7,200
Average latency (msec) 4.17
Internal transfer rate
(Gbits/sec max)
1.1
I/O data transfer rate
(Gbits/sec max)
3.0
ATA data-transfer modes
supported
SATA 1.0, Serial ATA Revision 2.6
PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–6
Height (max) 9.5 +/- 0.2 mm (0.374 +/- .0078 inches)
Width (max) 69.85 +/- 0.249 mm (2.75 +/- 0.0098 inches)
Length (max) 100.3 +/- 0.25 mm (3.95 +/- .010 inches)
Weight (max) 110 grams (0.238 lb) 105 grams (0.227 lb)
Power-on to ready
(sec typical)
4.0