Product comparison · 2 internal hard drives

Seagate 120GB 2.5 vs Seagate 40GB 3.5

24specifications compared
16differ
8identical
15known for one product only

Key differences

HDD capacity
- 120GB 2.5:120 GB
- 40GB 3.5:40 GB
HDD speed
- 120GB 2.5:5400 RPM
- 40GB 3.5:7200 RPM
HDD size
- 120GB 2.5:2.5"
- 40GB 3.5:3.5"
Interface
- 120GB 2.5:Serial ATA
- 40GB 3.5:Ultra-ATA/100
Storage drive buffer size
- 120GB 2.5:8 MB
- 40GB 3.5:2 MB
HDD number of heads
- 120GB 2.5:3
- 40GB 3.5:16
Write seek time
- 120GB 2.5:13 ms
- 40GB 3.5:12 ms
Average latency
- 120GB 2.5:5.6 ms
- 40GB 3.5:4.16 ms

Side by side

Differences highlightedShow differences only

Comparison of 120GB 2.5, 40GB 3.5
39 specifications	A Seagate 120GB 2.5 View product	B Seagate 40GB 3.5 View product
Features8 differ
HDD capacityDiffers	120 GB	40 GB
HDD speedDiffers	5400 RPM	7200 RPM
HDD sizeDiffers	2.5"	3.5"
InterfaceDiffers	Serial ATA	Ultra-ATA/100
Storage drive buffer sizeDiffers	8 MB	2 MB
HDD number of cylindersKnown for one	Unknown — not stated by the source	16383
HDD number of headsDiffers	3	16
Write seek timeDiffers	13 ms	12 ms
Average latencyDiffers	5.6 ms	4.16 ms
Bytes per sectorKnown for one	Unknown — not stated by the source	512
Start/stop cyclesKnown for one	Unknown — not stated by the source	50000
Component forKnown for one	Laptop	Unknown — not stated by the source
Power2 differ
Operating voltageDiffers	5 V	5 / 12 V
Start-up currentDiffers	1 A	2.8 A
Power consumption (standby)Known for one	0.2 W	Unknown — not stated by the source
Power consumption (idle)Known for one	0.6 W	Unknown — not stated by the source
Power consumption (read)Known for one	1.9 W	Unknown — not stated by the source
Power consumption (write)Known for one	1.8 W	Unknown — not stated by the source
Operational conditions2 differ
Operating shockDiffers	350 G	63 G
Non-operating shockDiffers	800 G	350 G
Packaging contentidentical
Storage drive adapter includedKnown for one	Unknown — not stated by the source	No
Weight & dimensions4 differ
WidthDiffers	69.8 mm	101.6 mm
DepthDiffers	100.2 mm	146.9 mm
HeightDiffers	9.5 mm	26 mm
WeightDiffers	102 g	580 g
Packaging dataidentical
Quantity per packKnown for one	Unknown — not stated by the source	1 pc(s)
Other featuresidentical
Drive devices burst data transfer rate (DMA)Known for one	Unknown — not stated by the source	2
Drive devices burst data transfer rate (PIO)Known for one	Unknown — not stated by the source	4
Drive devices burst data transfer rate (Ultra DMA)Known for one	Unknown — not stated by the source	5
Windows operating systems supportedKnown for one	Yes	Unknown — not stated by the source
Linux operating systems supportedKnown for one	Yes	Unknown — not stated by the source

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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