Product comparison · 2 internal hard drives

Acer 120GB 2.5” 5400rpm hard drive vs HP 20GB Ultra ATA/100 IDE

6specifications compared
4differ
2identical
5known for one product only

Key differences

The Acer 120GB 2.5” 5400rpm hard drive has 100 GB more HDD capacity than the HP 20GB Ultra ATA/100 IDE (120 GB vs 20 GB). The HP 20GB Ultra ATA/100 IDE has 1" more HDD size than the Acer 120GB 2.5” 5400rpm hard drive (3.5" vs 2.5"). Interface: Serial ATA on the Acer 120GB 2.5” 5400rpm hard drive, Ultra-ATA/100 on the HP 20GB Ultra ATA/100 IDE. Operating voltage: 5 V on the Acer 120GB 2.5” 5400rpm hard drive, 5 / 12 V on the HP 20GB Ultra ATA/100 IDE.

HDD capacity
- 120GB 2.5” 5400rpm hard drive:120 GB
- 20GB Ultra ATA/100 IDE:20 GB
HDD size
- 120GB 2.5” 5400rpm hard drive:2.5"
- 20GB Ultra ATA/100 IDE:3.5"
Interface
- 120GB 2.5” 5400rpm hard drive:Serial ATA
- 20GB Ultra ATA/100 IDE:Ultra-ATA/100
Operating voltage
- 120GB 2.5” 5400rpm hard drive:5 V
- 20GB Ultra ATA/100 IDE:5 / 12 V

Side by side

Differences highlightedShow differences only

Comparison of 120GB 2.5” 5400rpm hard drive, 20GB Ultra ATA/100 IDE
11 specifications	A Acer 120GB 2.5” 5400rpm hard drive View product	B HP 20GB Ultra ATA/100 IDE View product
Features3 differ
HDD capacityDiffers	120 GB	20 GB
HDD sizeDiffers	2.5"	3.5"
InterfaceDiffers	Serial ATA	Ultra-ATA/100
Storage drive buffer sizeKnown for one	8 MB	Unknown — not stated by the source
TypeKnown for one	Unknown — not stated by the source	HDD
Power1 differ
Operating voltageDiffers	5 V	5 / 12 V
Weight & dimensionsidentical
WeightKnown for one	100 g	Unknown — not stated by the source
Other featuresidentical
Dimensions (WxDxH)Known for one	70 x 100 x 9.5 mm	Unknown — not stated by the source
Maximum data transfer rateKnown for one	Unknown — not stated by the source	100 Mbit/s

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.

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