Product comparison · 2 internal hard drives

Seagate ST31000524AS, 20pack vs Seagate Constellation ST91000642SS internal hard drive

21specifications compared
14differ
7identical
15known for one product only

Key differences

HDD size
- ST31000524AS, 20pack:3.5"
- Constellation ST91000642SS internal hard drive:2.5"
Interface
- ST31000524AS, 20pack:Serial ATA
- Constellation ST91000642SS internal hard drive:SAS
Storage drive buffer size
- ST31000524AS, 20pack:32 MB
- Constellation ST91000642SS internal hard drive:64 MB
Read seek time
- ST31000524AS, 20pack:8.5 ms
- Constellation ST91000642SS internal hard drive:7.5 ms
Write seek time
- ST31000524AS, 20pack:9.5 ms
- Constellation ST91000642SS internal hard drive:8.5 ms
Average latency
- ST31000524AS, 20pack:4.17 ms
- Constellation ST91000642SS internal hard drive:4.16 ms
Operating voltage
- ST31000524AS, 20pack:5 / 12 V
- Constellation ST91000642SS internal hard drive:5 V
Operating temperature (T-T)
- ST31000524AS, 20pack:0 - 60 °C
- Constellation ST91000642SS internal hard drive:5 - 60 °C

Side by side

Differences highlightedShow differences only

Comparison of ST31000524AS, 20pack, ST91000642SS
36 specifications	A Seagate ST31000524AS, 20pack View product	B Seagate Constellation ST91000642SS internal hard drive Model ST91000642SS View product
Features6 differ
HDD sizeDiffers	3.5"	2.5"
InterfaceDiffers	Serial ATA	SAS
Component forKnown for one	Unknown — not stated by the source	Server/workstation
Storage drive buffer sizeDiffers	32 MB	64 MB
HDD number of headsKnown for one	Unknown — not stated by the source	8
Read seek timeDiffers	8.5 ms	7.5 ms
Write seek timeDiffers	9.5 ms	8.5 ms
Average latencyDiffers	4.17 ms	4.16 ms
Mean time between failures (MTBF)Known for one	Unknown — not stated by the source	1400000 h
Power1 differ
Power consumption (typical)Known for one	Unknown — not stated by the source	6.35 W
Operating voltageDiffers	5 / 12 V	5 V
Power consumption (idle)Known for one	5 W	Unknown — not stated by the source
Operational conditions2 differ
Operating temperature (T-T)Differs	0 - 60 °C	5 - 60 °C
Operating relative humidity (H-H)Known for one	Unknown — not stated by the source	5 - 95%
Storage relative humidity (H-H)Known for one	Unknown — not stated by the source	5 - 95%
Operating vibrationKnown for one	Unknown — not stated by the source	0.5 G
Non-operating vibrationKnown for one	Unknown — not stated by the source	3 G
Operating altitudeKnown for one	Unknown — not stated by the source	-60.96 - 3048 m
Non-operating altitudeKnown for one	Unknown — not stated by the source	-60.96 - 12192 m
Non-operating shockDiffers	300 G	400 G
Weight & dimensions4 differ
WidthDiffers	101.6 mm	69.8 mm
DepthDiffers	147 mm	100 mm
HeightDiffers	20.2 mm	15 mm
WeightDiffers	4 kg	200 g
Other features1 differ
Data transfer rateDiffers	6 Gbit/s	4.69 Gbit/s
Plug and PlayKnown for one	Unknown — not stated by the source	Yes
Number of products includedKnown for one	20 pc(s)	Unknown — not stated by the source
Recording densityKnown for one	329 kbit/inch	Unknown — not stated by the source
USB poweredKnown for one	No	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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