Product comparison · 2 internal hard drives

Seagate Momentus XT 320GB vs Seagate Constellation ST31000425SS internal hard drive

17specifications compared
15differ
2identical
12known for one product only

Key differences

HDD capacity
- Momentus XT 320GB:320 GB
- Constellation ST31000425SS internal hard drive:1 TB
HDD size
- Momentus XT 320GB:2.5"
- Constellation ST31000425SS internal hard drive:3.5"
Interface
- Momentus XT 320GB:Serial ATA
- Constellation ST31000425SS internal hard drive:Serial ATA II
Storage drive buffer size
- Momentus XT 320GB:32 MB
- Constellation ST31000425SS internal hard drive:16 MB
Read seek time
- Momentus XT 320GB:11 ms
- Constellation ST31000425SS internal hard drive:8.5 ms
Write seek time
- Momentus XT 320GB:13 ms
- Constellation ST31000425SS internal hard drive:9.5 ms
Average latency
- Momentus XT 320GB:4.17 ms
- Constellation ST31000425SS internal hard drive:4.16 ms
Power consumption (typical)
- Momentus XT 320GB:1.1 W
- Constellation ST31000425SS internal hard drive:8 W

Side by side

Differences highlightedShow differences only

Comparison of Momentus XT 320GB, ST31000425SS
29 specifications	A Seagate Momentus XT 320GB View product	B Seagate Constellation ST31000425SS internal hard drive Model ST31000425SS View product
Features7 differ
HDD capacityDiffers	320 GB	1 TB
HDD speed	7200 RPM	7200 RPM
HDD sizeDiffers	2.5"	3.5"
InterfaceDiffers	Serial ATA	Serial ATA II
Component forKnown for one	Laptop	Unknown — not stated by the source
Storage drive buffer sizeDiffers	32 MB	16 MB
Read seek timeDiffers	11 ms	8.5 ms
Write seek timeDiffers	13 ms	9.5 ms
Average latencyDiffers	4.17 ms	4.16 ms
Power2 differ
Power consumption (typical)Differs	1.1 W	8 W
Power consumption (idle)Known for one	0.8 W	Unknown — not stated by the source
Operating voltageDiffers	5 V	5 / 12 V
Start-up currentKnown for one	1 A	Unknown — not stated by the source
Operational conditions2 differ
Operating temperature (T-T)Differs	0 - 60 °C	5 - 60 °C
Storage temperature (T-T)Known for one	-40 - 70 °C	Unknown — not stated by the source
Operating shockDiffers	350 G	70 G
Non-operating shockKnown for one	1000 G	Unknown — not stated by the source
Weight & dimensions4 differ
WidthDiffers	70.1 mm	101.6 mm
DepthDiffers	100.5 mm	147 mm
HeightDiffers	9.7 mm	26.1 mm
WeightDiffers	105 g	640 g
Other featuresidentical
Data transfer rateKnown for one	3 Gbit/s	Unknown — not stated by the source
Flash memoryKnown for one	4096 MB	Unknown — not stated by the source
Internal	Yes	Yes
Drive device, transfer rateKnown for one	Unknown — not stated by the source	150 MB/s
External power adapterKnown for one	Unknown — not stated by the source	No
Mac compatibilityKnown for one	Unknown — not stated by the source	No
USB poweredKnown for one	Unknown — not stated by the source	No
USB requiredKnown for one	Unknown — not stated by the source	No

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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