Product comparison · 2 internal hard drives

Seagate 40GB 3.5" SATA II vs Seagate 80GB 3.5" Ultra ATA/100

27specifications compared
8differ
19identical
7known for one product only

Key differences

The Seagate 80GB 3.5" Ultra ATA/100 has 40 GB more HDD capacity than the Seagate 40GB 3.5" SATA II (80 GB vs 40 GB). The Seagate 40GB 3.5" SATA II has 1,800 RPM more HDD speed than the Seagate 80GB 3.5" Ultra ATA/100 (7200 RPM vs 5400 RPM). The Seagate 40GB 3.5" SATA II has 1 MB more storage drive buffer size than the Seagate 80GB 3.5" Ultra ATA/100 (2 MB vs 1 MB). Interface: Serial ATA II on the Seagate 40GB 3.5" SATA II, Ultra-ATA/100 on the Seagate 80GB 3.5" Ultra ATA/100.

HDD capacity
- 40GB 3.5" SATA II:40 GB
- 80GB 3.5" Ultra ATA/100:80 GB
HDD speed
- 40GB 3.5" SATA II:7200 RPM
- 80GB 3.5" Ultra ATA/100:5400 RPM
Interface
- 40GB 3.5" SATA II:Serial ATA II
- 80GB 3.5" Ultra ATA/100:Ultra-ATA/100
Storage drive buffer size
- 40GB 3.5" SATA II:2 MB
- 80GB 3.5" Ultra ATA/100:1 MB
Read seek time
- 40GB 3.5" SATA II:14 ms
- 80GB 3.5" Ultra ATA/100:8.5 ms
Write seek time
- 40GB 3.5" SATA II:16 ms
- 80GB 3.5" Ultra ATA/100:9.5 ms
Height
- 40GB 3.5" SATA II:26.1 mm
- 80GB 3.5" Ultra ATA/100:26 mm
Weight
- 40GB 3.5" SATA II:580 g
- 80GB 3.5" Ultra ATA/100:635 g

Side by side

Differences highlightedShow differences only

Comparison of 40GB 3.5" SATA II, 80GB 3.5" Ultra ATA/100
34 specifications	A Seagate 40GB 3.5" SATA II View product	B Seagate 80GB 3.5" Ultra ATA/100 View product
Features6 differ
HDD capacityDiffers	40 GB	80 GB
HDD speedDiffers	7200 RPM	5400 RPM
InterfaceDiffers	Serial ATA II	Ultra-ATA/100
Storage drive buffer sizeDiffers	2 MB	1 MB
Read seek timeDiffers	14 ms	8.5 ms
Write seek timeDiffers	16 ms	9.5 ms
Bytes per sectorKnown for one	Unknown — not stated by the source	512
Mean time between failures (MTBF)Known for one	Unknown — not stated by the source	600000 h
HDD number of headsKnown for one	16	Unknown — not stated by the source
Poweridentical
Power consumption (standby)Known for one	Unknown — not stated by the source	0.9 W
Power consumption (idle)Known for one	Unknown — not stated by the source	7.5 W
Power consumption (read)Known for one	Unknown — not stated by the source	12 W
Power consumption (write)Known for one	Unknown — not stated by the source	12 W
Weight & dimensions2 differ
HeightDiffers	26.1 mm	26 mm
WeightDiffers	580 g	635 g

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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