Product comparison · 2 internal hard drives

Seagate Constellation ST91000640NS-40PK internal hard drive vs Seagate Constellation ST91000641SS-40PK internal hard drive

23specifications compared
3differ
20identical
5known for one product only

Key differences

The Seagate Constellation ST91000641SS-40PK internal hard drive has 1.19 W more power consumption (typical) than the Seagate Constellation ST91000640NS-40PK internal hard drive (6.4 W vs 5.21 W). The Seagate Constellation ST91000641SS-40PK internal hard drive has 0.54 W more power consumption (idle) than the Seagate Constellation ST91000640NS-40PK internal hard drive (3.85 W vs 3.31 W). Interface: Serial ATA III on the Seagate Constellation ST91000640NS-40PK internal hard drive, SAS on the Seagate Constellation ST91000641SS-40PK internal hard drive.

Interface
- Constellation ST91000640NS-40PK internal hard drive:Serial ATA III
- Constellation ST91000641SS-40PK internal hard drive:SAS
Power consumption (typical)
- Constellation ST91000640NS-40PK internal hard drive:5.21 W
- Constellation ST91000641SS-40PK internal hard drive:6.4 W
Power consumption (idle)
- Constellation ST91000640NS-40PK internal hard drive:3.31 W
- Constellation ST91000641SS-40PK internal hard drive:3.85 W

Side by side

Differences highlightedShow differences only

Comparison of ST91000640NS-40PK, ST91000641SS-40PK
28 specifications	A Seagate Constellation ST91000640NS-40PK internal hard drive Model ST91000640NS-40PK View product	B Seagate Constellation ST91000641SS-40PK internal hard drive Model ST91000641SS-40PK View product
Features1 differ
HDD capacity	1 TB	1 TB
HDD speed	7200 RPM	7200 RPM
HDD size	2.5"	2.5"
InterfaceDiffers	Serial ATA III	SAS
Type	HDD	HDD
Storage drive buffer size	64 MB	64 MB
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
Mean time between failures (MTBF)	1400000 h	1400000 h
HDD interface transfer rateKnown for one	Unknown — not stated by the source	6 Gbit/s
Bytes per sectorKnown for one	Unknown — not stated by the source	512
Power2 differ
Power consumption (typical)Differs	5.21 W	6.4 W
Power consumption (idle)Differs	3.31 W	3.85 W
Operating voltage	5 V	5 V
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
Packaging contentidentical
ManualKnown for one	Yes	Unknown — not stated by the source
Quick start guideKnown for one	Yes	Unknown — not stated by the source
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
Data transfer rateKnown for one	6 Gbit/s	Unknown — not stated by the source

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.

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