Product comparison · 2 internal hard drives

Dell 400-ALRW internal hard drive vs Seagate 640GB 2.5

7specifications compared
6differ
1identical
18known for one product only

Key differences

HDD capacity
- 400-ALRW internal hard drive:1 TB
- 640GB 2.5:640 GB
HDD speed
- 400-ALRW internal hard drive:7200 RPM
- 640GB 2.5:5400 RPM
HDD size
- 400-ALRW internal hard drive:3.5"
- 640GB 2.5:2.5"
Interface
- 400-ALRW internal hard drive:NL-SAS
- 640GB 2.5:Serial ATA II
HDD interface transfer rate
- 400-ALRW internal hard drive:1.2 Gbit/s
- 640GB 2.5:3 Gbit/s
Operating voltage
- 400-ALRW internal hard drive:5 / 12 V
- 640GB 2.5:5 V

Side by side

Differences highlightedShow differences only

Comparison of 400-ALRW, 640GB 2.5
25 specifications	A Dell 400-ALRW internal hard drive Model 400-ALRW View product	B Seagate 640GB 2.5 View product
Features5 differ
HDD capacityDiffers	1 TB	640 GB
HDD speedDiffers	7200 RPM	5400 RPM
HDD sizeDiffers	3.5"	2.5"
InterfaceDiffers	NL-SAS	Serial ATA II
Component forKnown for one	Unknown — not stated by the source	Laptop
Storage drive buffer sizeKnown for one	Unknown — not stated by the source	8 MB
HDD interface transfer rateDiffers	1.2 Gbit/s	3 Gbit/s
Read seek timeKnown for one	Unknown — not stated by the source	11 ms
Average latencyKnown for one	Unknown — not stated by the source	5.5 ms
Bytes per sectorKnown for one	Unknown — not stated by the source	512
Hot-swapKnown for one	Yes	Unknown — not stated by the source
Power1 differ
Power consumption (idle)Known for one	Unknown — not stated by the source	0.68 W
Operating voltageDiffers	5 / 12 V	5 V
Operational conditionsidentical
Operating temperature (T-T)Known for one	Unknown — not stated by the source	0 - 60 °C
Storage temperature (T-T)Known for one	Unknown — not stated by the source	-40 - 70 °C
Operating shockKnown for one	Unknown — not stated by the source	350 G
Non-operating shockKnown for one	Unknown — not stated by the source	800 G
Weight & dimensionsidentical
WidthKnown for one	Unknown — not stated by the source	69.8 mm
DepthKnown for one	Unknown — not stated by the source	100.3 mm
HeightKnown for one	Unknown — not stated by the source	9.5 mm
WeightKnown for one	Unknown — not stated by the source	100 g
Other featuresidentical
Product colourKnown for one	Unknown — not stated by the source	Black
InternalKnown for one	Unknown — not stated by the source	Yes
Acoustic pressure emissionsKnown for one	Unknown — not stated by the source	26 dB

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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