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Momentus 5400.4 SATA Product Manual, Rev. B (Draft 02)
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
ST9250827AS, ST9200827AS, ST9160827AS, and ST9120817AS 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 ST9250827AS ST9200827AS ST9160827AS ST9120817AS
Formatted Gbytes
(512 bytes/sector)*
250 200 160 120
Guaranteed sectors 488,397,168 390,721,968 312,581,808 234,441,648
Bytes per sector 512
Physical read/write heads 4 4 3 2
Discs 2 2 2 1
Cache (Mbytes) 8
Recording density in BPI (bits/inch max) 1,180k
Track density TPI (tracks/inch max) 173k
Areal density (Gbits/inch
2
max) 204
Spindle speed (RPM) 5,400
Internal transfer rate (Mbits/sec max) 778
Sustained transfer rate (Mbytes/sec max) 58
I/O data transfer rate (Mbytes/sec max) 300
ATA data-transfer modes supported SATA 1.0, Serial ATA Revision 2.5
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 +/- 0.25 mm (2.75 +/- 0.0098 inches)
Length (max) 100.20 +/- 0.25 mm (3.945 +/- 0.010 inches)
Weight (typical) </=102 grams (0.23 lb) 97 grams (0.21 lb)
Average latency (msec) 5.6
Power-on to ready (sec typical) <3.0
Standby to ready (sec typical) <2.0
Track-to-track seek time (msec typical) <2.0 (read), <2.5 (write)
Average seek, read (msec typical) <12.0
Average seek, write (msec typical) <14.0