Seagate ST9500423ASG, ST9750422AS, ST9750424AS Drive specifications, Specification summary table

3.0Drive specifications

Unless otherwise noted, all specifications are measured under ambient conditions, at 25°C, and nominal power.

3.1Specification 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

		ST9640424AS	ST9750422AS	ST9500424AS
	ST9750423AS	ST9640423AS	ST9750420AS	ST9500423AS
Drive specification	ST9750423ASG	ST9640423ASG	ST9750420ASG	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/in2 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

4 Momentus Product Manual, Rev. C