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4 Momentus Product Manual, Rev. B
3.0 Drive specifications
Unless otherwise noted, all specifications are measured under ambient conditions, at 25°C, and nominal
power.
3.1 Specification summary table
The specifications listed in this table are for quick reference. For details on specification measurement or
definition, see the appropriate section of this manual.
Table 1: Drive specifications for 750, 640 and 500 GB models
Drive specification
ST9750423AS
ST9750423ASG
ST9640424AS
ST9640423AS
ST9640423ASG
ST9750422AS
ST9750420AS
ST9750420ASG
ST9500424AS
ST9500423AS
ST9500423ASG
Formatted GB 750 640 750 500
Guaranteed sectors 1,465,149,168 1,250,263,728 1,465,149,168 976,773,168
Bytes per sector (logical/physical) 512/4K
Physical read/write heads 4 4/3
Discs 2
Cache (MB) 16
Recording density in BPI (max) 1,586k
Track density TPI (tracks/inch max) 341k
Areal density (Gb/in
2
max) 541
Spindle speed (RPM) 5400 7200
Average latency (ms) 5.6 4.2
Internal transfer rate (Gb/s max) 1130 950 1305 1305
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 9.5 +/- 0.2 mm (0.370 +/-.008 in)
Width 69.85 +/- 0.25 mm (2.750 +/- 0.010 in)
Length 100.35 +0.20 / -0.25 mm (3.951 +0.008 / -0.010 in)
Weight 115 g (0.254 lb)
Power-on to ready (sec typical) 3.6 4.0
Standby to ready (sec typical) 2.5 3.0
Track-to-track seek time, read (ms typ) 1.5
Average seek, read (ms typical) 11.0
Average seek, write (ms typical) 13.0
Startup current, +5V (max) 1.0A
Seek power (typical) 1.9W 2.5W
Read power (typical) 1.6W 2.1W