Product comparison · 2 external hard drives

ADATA 250GB Nobility NH92 2.5” vs ADATA 640GB Classic CH91 2.5”

Key differences

HDD capacity
- 250GB Nobility NH92 2.5”:250 GB
- 640GB Classic CH91 2.5”:640 GB
Product colour
- 250GB Nobility NH92 2.5”:Pink
- 640GB Classic CH91 2.5”:White
Dimensions (WxDxH)
- 250GB Nobility NH92 2.5”:75.8 x 114 x 12 mm
- 640GB Classic CH91 2.5”:82 x 134 x 15.7 mm

Differences highlightedShow differences only

Comparison of 250GB Nobility NH92 2.5”, 640GB Classic CH91 2.5”
17 specifications	A ADATA 250GB Nobility NH92 2.5”View product	B ADATA 640GB Classic CH91 2.5”View product
Hard drive1 differ
HDD capacityDiffers	250 GB	640 GB
HDD speed	5400 RPM	5400 RPM
HDD size	2.5"	2.5"
Interface	Serial ATA	Serial ATA
Type	HDD	HDD
Features1 differ
Product colourDiffers	Pink	White
Plug and Play	Yes	Yes
Poweridentical
Bus powered	USB	USB
Weight & dimensionsidentical
WeightKnown for one	152 g	Unknown — not stated by the source
Packaging dataidentical
Bundled software	HDD to go	HDD to go
Other features1 differ
Drive device, transfer rate	30 MB/s	30 MB/s
Internal	No	No
Mac compatibility	Yes	Yes
USB 2.0 ports quantity	1	1
USB required	Yes	Yes
Compatible operating systems	Windows 2000, XP, Vista 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	75.8 x 114 x 12 mm	82 x 134 x 15.7 mm

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.