Product comparison · 2 external hard drives

ADATA 250GB Classic CH91 2.5” vs ADATA 640GB SH93

Key differences

HDD capacity
- 250GB Classic CH91 2.5”:250 GB
- 640GB SH93:640 GB
Product colour
- 250GB Classic CH91 2.5”:Blue
- 640GB SH93:Black, Yellow
Dimensions (WxDxH)
- 250GB Classic CH91 2.5”:82 x 134 x 15.7 mm
- 640GB SH93:97 x 129 x 19.2 mm

Differences highlightedShow differences only

Comparison of 250GB Classic CH91 2.5”, 640GB SH93
27 specifications	A ADATA 250GB Classic CH91 2.5”View product	B ADATA 640GB SH93 View product
Hard drive1 differ
HDD capacityDiffers	250 GB	640 GB
HDD speedKnown for one	5400 RPM	Unknown — not stated by the source
InterfaceKnown for one	Serial ATA	Unknown — not stated by the source
Ports & interfacesidentical
Maximum data transfer rateKnown for one	Unknown — not stated by the source	480 Mbit/s
USB connectorKnown for one	Unknown — not stated by the source	USB
USB versionKnown for one	Unknown — not stated by the source	2.0
Features1 differ
Product colourDiffers	Blue	Black, Yellow
LED indicatorsKnown for one	Unknown — not stated by the source	Yes
Weight & dimensionsidentical
WidthKnown for one	Unknown — not stated by the source	97 mm
DepthKnown for one	Unknown — not stated by the source	129 mm
HeightKnown for one	Unknown — not stated by the source	19.2 mm
WeightKnown for one	Unknown — not stated by the source	240 g
Other features2 differ
MaterialKnown for one	Unknown — not stated by the source	Rubber
Quick start guideKnown for one	Unknown — not stated by the source	Yes
USB cableKnown for one	Unknown — not stated by the source	USB
Compatible operating systemsDiffers	Windows 2000, XP, Vista Mac OS X 10.4+ Linux Kernal 2.4+	Windows XP/Vista/7 Mac OS X 10.5, 10.6 Linux 2.4
Dimensions (WxDxH)Differs	82 x 134 x 15.7 mm	97 x 129 x 19.2 mm
Packaging dataidentical
Bundled softwareKnown for one	HDD to go	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.