Product comparison · 2 external hard drives

ADATA 320GB CH94 HDD vs ADATA 640GB Classic CH91 2.5”

9specifications compared
3differ
6identical
9known for one product only

Key differences

HDD capacity
- 320GB CH94 HDD:320 GB
- 640GB Classic CH91 2.5”:640 GB
Dimensions (WxDxH)
- 320GB CH94 HDD:86.8 x 130.6 x 14.5 mm
- 640GB Classic CH91 2.5”:82 x 134 x 15.7 mm

Side by side

Differences highlightedShow differences only

Comparison of 320GB CH94 HDD, 640GB Classic CH91 2.5”
18 specifications	A ADATA 320GB CH94 HDD View product	B ADATA 640GB Classic CH91 2.5”View product
Hard drive1 differ
HDD capacityDiffers	320 GB	640 GB
HDD speedKnown for one	Unknown — not stated by the source	5400 RPM
InterfaceKnown for one	Unknown — not stated by the source	Serial ATA
Featuresidentical
Plug and PlayKnown for one	Unknown — not stated by the source	Yes
Poweridentical
Bus poweredKnown for one	Unknown — not stated by the source	USB
Packaging dataidentical
Bundled softwareKnown for one	Unknown — not stated by the source	HDD to go
Other features2 differ
Drive device, transfer rateKnown for one	Unknown — not stated by the source	30 MB/s
USB requiredKnown for one	Unknown — not stated by the source	Yes
Compatible operating systemsDiffers	Windows 2000, XP, Vista, 7 / Mac OS X 10.4 / Linux Kernal 2.4	Windows 2000, XP, Vista Mac OS X 10.4+ Linux Kernal 2.4+
Dimensions (WxDxH)Differs	86.8 x 130.6 x 14.5 mm	82 x 134 x 15.7 mm
Interface typeKnown for one	USB 2.0	Unknown — not stated by the source
Weight & dimensionsidentical
WeightKnown for one	172 g	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.

More external hard drive comparisons

All external hard drive comparisons