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 t his drive are u sed thr ough out this m anua l to indi cate the
ST9120821AS, ST9100824AS, ST98823AS, ST96812AS, ST94813AS and ST93811AS 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 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/inch2 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