Product comparison · 2 internal hard drives

Seagate 2 TB, SAS, 7200 RPM vs Seagate Constellation ST91000640NS-40PK internal hard drive

Key differences

HDD capacity
- 2 TB, SAS, 7200 RPM:2 TB
- Constellation ST91000640NS-40PK internal hard drive:1 TB
Interface
- 2 TB, SAS, 7200 RPM:SAS
- Constellation ST91000640NS-40PK internal hard drive:Serial ATA III
Storage drive buffer size
- 2 TB, SAS, 7200 RPM:128 MB
- Constellation ST91000640NS-40PK internal hard drive:64 MB
Mean time between failures (MTBF)
- 2 TB, SAS, 7200 RPM:2000000 h
- Constellation ST91000640NS-40PK internal hard drive:1400000 h
Power consumption (typical)
- 2 TB, SAS, 7200 RPM:6.02 W
- Constellation ST91000640NS-40PK internal hard drive:5.21 W
Power consumption (idle)
- 2 TB, SAS, 7200 RPM:3.53 W
- Constellation ST91000640NS-40PK internal hard drive:3.31 W
Operating temperature (T-T)
- 2 TB, SAS, 7200 RPM:5 - 55 °C
- Constellation ST91000640NS-40PK internal hard drive:5 - 60 °C
Operating shock
- 2 TB, SAS, 7200 RPM:25 G
- Constellation ST91000640NS-40PK internal hard drive:70 G

Differences highlightedShow differences only

Comparison of 2 TB, SAS, 7200 RPM, ST91000640NS-40PK
30 specifications	A Seagate 2 TB, SAS, 7200 RPM View product	B Seagate Constellation ST91000640NS-40PK internal hard drive Model ST91000640NS-40PK View product
Features4 differ
HDD capacityDiffers	2 TB	1 TB
InterfaceDiffers	SAS	Serial ATA III
Storage drive buffer sizeDiffers	128 MB	64 MB
Read seek timeKnown for one	Unknown — not stated by the source	8.5 ms
Write seek timeKnown for one	Unknown — not stated by the source	9.5 ms
Mean time between failures (MTBF)Differs	2000000 h	1400000 h
Component forKnown for one	Server/workstation	Unknown — not stated by the source
HDD interface transfer rateKnown for one	12 Gbit/s	Unknown — not stated by the source
Bytes per sectorKnown for one	4096	Unknown — not stated by the source
Power2 differ
Power consumption (typical)Differs	6.02 W	5.21 W
Power consumption (idle)Differs	3.53 W	3.31 W
Power consumption (standby)Known for one	1.52 W	Unknown — not stated by the source
Operational conditions2 differ
Operating temperature (T-T)Differs	5 - 55 °C	5 - 60 °C
Operating shockDiffers	25 G	70 G
Packaging contentidentical
ManualKnown for one	Unknown — not stated by the source	Yes
Quick start guideKnown for one	Unknown — not stated by the source	Yes
Weight & dimensions1 differ
WeightDiffers	198 g	200 g
Other featuresidentical
Data transfer rateKnown for one	Unknown — not stated by the source	6 Gbit/s

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.