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Momentus 5400.2 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
ST9120821AS, ST9100824AS, ST98823AS, ST96812AS, ST94813AS and ST93811AS 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 ST9120821AS ST9100824AS ST98823AS ST96812AS ST94813AS ST93811AS
Formatted Gbytes (512 bytes/sector) 120 100 80 60 40 30
Guaranteed sectors 234,441,648 195,371,568 156,301,488 117,210,240 78,140,160 58,605,120
Bytes per sector 512
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Physical read/write heads 4 4 3 2 2 1
Discs 2 2 2 1 1 1
Recording density in BPI
(bits/inch max)
778k
Track density TPI (tracks/inch max) 126k
Areal density (Mbits/inch
2
max) 98.2
Spindle speed (RPM) 5,400
Internal transfer rate
(Mbytes/sec max)
42
I/O data transfer rate
(Mbytes/sec max)
150
ATA data-transfer modes supported SATA 1.0, SATA II
PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–6
Cache buffer 8 Mbytes
Height (max) 9.5 +/- 0.2 mm (0.374 +/- .0078 inches)
Width (max) 69.85 mm (2.75 +/- 0.0098 inches)
Length (max) 100.5 +/- 1.6 mm (3.96 +/- 0.063 inches)
Weight (typical) 100 grams (0.22 lb)
Average latency (msec) 5.56
Power-on to ready (typical) 3.5 sec
Standby to ready (typical) 3.0 sec