Product comparison · 2 internal hard drives

Seagate Constellation ST91000642SS internal hard drive vs Seagate Constellation ST9250612NS internal hard drive

29specifications compared
4differ
25identical
6known for one product only

Key differences

HDD capacity
- Constellation ST91000642SS internal hard drive:1 TB
- Constellation ST9250612NS internal hard drive:250 GB
Interface
- Constellation ST91000642SS internal hard drive:SAS
- Constellation ST9250612NS internal hard drive:Serial ATA
HDD number of heads
- Constellation ST91000642SS internal hard drive:8
- Constellation ST9250612NS internal hard drive:2
Weight
- Constellation ST91000642SS internal hard drive:200 g
- Constellation ST9250612NS internal hard drive:179 g

Side by side

Differences highlightedShow differences only

Comparison of ST91000642SS, ST9250612NS
35 specifications	A Seagate Constellation ST91000642SS internal hard drive Model ST91000642SS View product	B Seagate Constellation ST9250612NS internal hard drive Model ST9250612NS View product
Features3 differ
HDD capacityDiffers	1 TB	250 GB
HDD speed	7200 RPM	7200 RPM
HDD size	2.5"	2.5"
InterfaceDiffers	SAS	Serial ATA
Component forKnown for one	Server/workstation	Unknown — not stated by the source
Storage drive buffer size	64 MB	64 MB
HDD number of headsDiffers	8	2
Read seek time	7.5 ms	7.5 ms
Write seek time	8.5 ms	8.5 ms
Average latency	4.16 ms	4.16 ms
Bytes per sector	512	512
Mean time between failures (MTBF)Known for one	1400000 h	Unknown — not stated by the source
Track to track seek timeKnown for one	Unknown — not stated by the source	0.44 ms
Start/stop cyclesKnown for one	Unknown — not stated by the source	300000
Poweridentical
Power consumption (typical)Known for one	6.35 W	Unknown — not stated by the source
Operating voltage	5 V	5 V
Start-up current	2 A	2 A
Operational conditionsidentical
Operating temperature (T-T)	5 - 60 °C	5 - 60 °C
Storage temperature (T-T)	-40 - 70 °C	-40 - 70 °C
Operating relative humidity (H-H)	5 - 95%	5 - 95%
Storage relative humidity (H-H)	5 - 95%	5 - 95%
Operating vibration	0.5 G	0.5 G
Non-operating vibration	3 G	3 G
Operating altitude	-60.96 - 3048 m	-60.96 - 3048 m
Non-operating altitude	-60.96 - 12192 m	-60.96 - 12192 m
Operating shock	70 G	70 G
Non-operating shock	400 G	400 G
Weight & dimensions1 differ
Width	69.8 mm	69.8 mm
Depth	100 mm	100 mm
Height	15 mm	15 mm
WeightDiffers	200 g	179 g
Other featuresidentical
Data transfer rate	4.69 Gbit/s	4.69 Gbit/s
Internal	Yes	Yes
Plug and Play	Yes	Yes
Disks included quantityKnown for one	Unknown — not stated by the source	1 pc(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.

More internal hard drive comparisons

All internal hard drive comparisons