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Momentus 7200.4 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.
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
ST9500420AS
ST9500420ASG
ST9320423AS
ST9320423ASG
ST9250410AS
ST9250410ASG
ST9160412AS
ST9160412ASG
ST9120410AS
ST9120410ASG
ST980412AS
ST980412ASG
Formatted GB (512 bytes/sector)* 500 320 250 160 120 80
Guaranteed sectors 976,773,168 625,142,448 488,397,168 312,581,808 234,441,648 156,301,488
Bytes per sector 512
Physical read/write heads 4 3/4 2 2 1/2 1
Discs 221111
Cache (Mbytes) 16
Recording density in BPI (max) 1490k
Track density TPI (max) 265k
Areal density (Gb/in
2
max) 394
Spindle speed (RPM) 7200
Average latency (msec) 4.17
Internal transfer rate (Gb/s max) 1.23
I/O data transfer rate (Gb/s 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 (0.370 +/- .008 in)
Width (max) 69.85 +/- 0.25 mm (2.750 +/- 0.010 in)
Length (max) 100.35 +0.20 / -0.25 mm (3.951 +0 .008 / -0.010 in)
Weight (max) 110 grams (0.238 lb) 105 grams (0.227 lb)
Power-on to ready (sec typical) 4.5
Standby to ready (sec typical) 3.0
Track-to-track seek time, read
(ms typical)
1.5
Average seek, read (ms typical) 11.0
Average seek, write (ms typical) 13.0
Startup current, +5V (max) 1.0 amps
Seek power (typical) 2.2 watts