Samsung 400GB Serial ATA II HDD vs Samsung 400GB Serial ATA II HDD, 20-pack

Comparison of 400GB Serial ATA II HDD, 400GB Serial ATA II HDD, 20-pack

26 specifications	A Samsung 400GB Serial ATA II HDDView product	B Samsung 400GB Serial ATA II HDD, 20-packView product
Featuresidentical
HDD sizeKnown for one	3.5"	—Unknown — not stated by the source
Poweridentical
Operating voltageKnown for one	5 / 12 V	—Unknown — not stated by the source
Operational conditions1 differ
Operating altitudeKnown for one	0 - 3000 m	—Unknown — not stated by the source
Non-operating altitudeDiffers	0 - 12000 m	12000

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.