Product comparison · 2 internal hard drives

Seagate 320GB 2.5" SATA II vs Seagate 640GB 3.5'' SATA II

13specifications compared
11differ
2identical
19known for one product only

Key differences

HDD capacity
- 320GB 2.5" SATA II:320 GB
- 640GB 3.5'' SATA II:640 GB
HDD speed
- 320GB 2.5" SATA II:5400 RPM
- 640GB 3.5'' SATA II:7200 RPM
HDD size
- 320GB 2.5" SATA II:2.5"
- 640GB 3.5'' SATA II:3.5"
Storage drive buffer size
- 320GB 2.5" SATA II:8 MB
- 640GB 3.5'' SATA II:32 MB
Start/stop cycles
- 320GB 2.5" SATA II:600000
- 640GB 3.5'' SATA II:50000
Mean time between failures (MTBF)
- 320GB 2.5" SATA II:500000 h
- 640GB 3.5'' SATA II:750000 h
Operating voltage
- 320GB 2.5" SATA II:5 V
- 640GB 3.5'' SATA II:5 / 12 V
Width
- 320GB 2.5" SATA II:69.8 mm
- 640GB 3.5'' SATA II:101.6 mm

Side by side

Differences highlightedShow differences only

Comparison of 320GB 2.5" SATA II, 640GB 3.5'' SATA II
32 specifications	A Seagate 320GB 2.5" SATA II View product	B Seagate 640GB 3.5'' SATA II View product
Features6 differ
HDD capacityDiffers	320 GB	640 GB
HDD speedDiffers	5400 RPM	7200 RPM
HDD sizeDiffers	2.5"	3.5"
Interface	Serial ATA II	Serial ATA II
Type	HDD	HDD
Component forKnown for one	Laptop	Unknown — not stated by the source
Storage drive buffer sizeDiffers	8 MB	32 MB
HDD number of headsKnown for one	4	Unknown — not stated by the source
Average latencyKnown for one	5.56 ms	Unknown — not stated by the source
Bytes per sectorKnown for one	512	Unknown — not stated by the source
Start/stop cyclesDiffers	600000	50000
Mean time between failures (MTBF)Differs	500000 h	750000 h
Power1 differ
Power consumption (standby)Known for one	0.205 W	Unknown — not stated by the source
Power consumption (idle)Known for one	0.685 W	Unknown — not stated by the source
Power consumption (read)Known for one	1.6 W	Unknown — not stated by the source
Power consumption (write)Known for one	1.6 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 conditionsidentical
Operating temperature (T-T)Known for one	0 - 60 °C	Unknown — not stated by the source
Storage temperature (T-T)Known for one	-40 - 70 °C	Unknown — not stated by the source
Operating relative humidity (H-H)Known for one	5 - 90%	Unknown — not stated by the source
Storage relative humidity (H-H)Known for one	5 - 95%	Unknown — not stated by the source
Operating altitudeKnown for one	-304.8 - 3048 m	Unknown — not stated by the source
Non-operating altitudeKnown for one	-304.8 - 3048 m	Unknown — not stated by the source
Operating shockKnown for one	350 G	Unknown — not stated by the source
Non-operating shockKnown for one	1000 G	Unknown — not stated by the source
Weight & dimensions4 differ
WidthDiffers	69.8 mm	101.6 mm
DepthDiffers	100.5 mm	147 mm
HeightDiffers	9.5 mm	26.1 mm
WeightDiffers	110 g	380 g
Other featuresidentical
Data transfer rateKnown for one	Unknown — not stated by the source	3 Gbit/s
InternalKnown for one	Unknown — not stated by the source	Yes

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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