Product comparison · 2 internal hard drives

Seagate ST91000640SS-40PK internal hard drive vs Seagate Constellation ST91000642SS-40PK internal hard drive

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Comparison of ST91000640SS-40PK, ST91000642SS-40PK
28 specifications	A Seagate ST91000640SS-40PK internal hard drive Model ST91000640SS-40PK View product	B Seagate Constellation ST91000642SS-40PK internal hard drive Model ST91000642SS-40PK View product
Featuresidentical
HDD capacity	1 TB	1 TB
HDD speed	7200 RPM	7200 RPM
HDD size	2.5"	2.5"
Interface	SAS	SAS
Type	HDD	HDD
Component for	Server/workstation	Server/workstation
Storage drive buffer size	64 MB	64 MB
HDD interface transfer rateKnown for one	6 Gbit/s	Unknown — not stated by the source
Read seek time	8.5 ms	8.5 ms
Write seek time	9.5 ms	9.5 ms
Average latency	4.16 ms	4.16 ms
Bytes per sectorKnown for one	512	Unknown — not stated by the source
Mean time between failures (MTBF)	1400000 h	1400000 h
Poweridentical
Power consumption (typical)Known for one	6.4 W	Unknown — not stated by the source
Power consumption (idle)	3.85 W	3.85 W
Operating voltage	5 V	5 V
Power consumption (read)Known for one	Unknown — not stated by the source	6.4 W
Operational conditionsidentical
Operating temperature (T-T)	5 - 60 °C	5 - 60 °C
Operating vibration	0.5 G	0.5 G
Non-operating vibration	3 G	3 G
Operating shock	70 G	70 G
Non-operating shock	400 G	400 G
Weight & dimensionsidentical
Width	70.1 mm	70.1 mm
Depth	100.5 mm	100.5 mm
Height	15 mm	15 mm
Weight	200 g	200 g
Packaging dataidentical
Quantity per pack	40 pc(s)	40 pc(s)
Other featuresidentical
Security algorithmsKnown for one	Unknown — not stated by the source	256-bit AES, FIPS 140-2

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.