Seagate ST9500424AS, ST9750422AS Recording and interface technology, Physical characteristics

3.5	Recording and interface technology
Interface		Serial ATA (SATA)
Recording method		Perpendicular
Recording density BPI (bits/in max)		1,586k
Track density TPI (tracks/in max)		341k
Areal density (Gb/in2 max)		541
Spindle speed (RPM) (± 0.2%)		5400
(ST9750423AS, ST9750423ASG, ST9640424AS, ST9640423AS
and ST9640423ASG models only)
Spindle speed (RPM) (± 0.2%) (all other models)		7200
Maximum Internal transfer rate (Gb/s)		1130
(ST9750423AS and ST9750423ASG models)
Maximum Internal transfer rate (Gb/s)		1305
(ST9750422AS, ST9750420AS, ST9750420ASG, ST9500424AS,
ST9500423AS and ST9500423ASG models)
Maximum Internal transfer rate (Gb/s)		950
(ST9640424AS, ST9640423AS and ST9640423ASG models)
I/O data-transfer rate (Gb/s max)		3.0
Interleave		1:1
Cache buffer		16MB (16,384KB)

3.6Physical characteristics

Drive specification
Height	(mm)	9.5 +/-0.2
	(in)	0.370	+/-0.008
Width	(mm)	69.85	+/-0.25
	(in)	2.750	+/-0.010
Length	(mm)	100.35 +0.20 / -0.25
	(in)	3.951	+0.008 / -.010
Typical weight		115 g
all models
		0.254 lb

Momentus Product Manual, Rev. C 7