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 capacity	400 GB	400 GB
HDD speed	7200 RPM	7200 RPM
HDD sizeKnown for one	3.5"	—Unknown — not stated by the source
Interface	Serial ATA II	Serial ATA II
Storage drive buffer size	16 MB	16 MB
Full stroke seek time	18 ms	18 ms
Track to track seek time	0.8 ms	0.8 ms
Average seek time	8.9 ms	8.9 ms
Average latency	4.17 ms	4.17 ms
Bytes per sector	512	512
Mean time between failures (MTBF)	600000 h	600000 h
Poweridentical
Power consumption (typical)	10 W	10 W
Power consumption (standby)	1.3 W	1.3 W
Operating voltageKnown for one	5 / 12 V	—Unknown — not stated by the source
Operational conditions1 differ
Operating temperature (T-T)	0 - 60 °C	0 - 60 °C
Storage temperature (T-T)	-40 - 70 °C	-40 - 70 °C
Operating relative humidity (H-H)	5 - 90%	5 - 90%
Storage relative humidity (H-H)	5 - 95%	5 - 95%
Operating altitudeKnown for one	0 - 3000 m	—Unknown — not stated by the source
Non-operating altitudeDiffers	0 - 12000 m	12000
Operating shock	63 G	63 G
Non-operating shock	300 G	300 G
Other featuresidentical
HDD transfer rate	1000 Mbit/s	1000 Mbit/s
Power requirements	+5V±5%;+12V±10%	+5V±5%;+12V±10%
Drive ready time	10 s	10 s
Internal	Yes	Yes

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.