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 capacity	1 TB	1 TB
HDD speed	7200 RPM	7200 RPM
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
Bytes per sector	512	512
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
Start-up current	2 A	2 A
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
Storage temperature (T-T)	-40 - 70 °C	-40 - 70 °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
Operating shock	70 G	70 G
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
Internal	Yes	Yes
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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