Product comparison · 2 internal hard drives

Seagate 160GB 3.5" Ultra ATA/100 vs Seagate 40GB 2.5" Ultra ATA/100

16specifications compared
12differ
4identical
20known for one product only

Key differences

The Seagate 160GB 3.5" Ultra ATA/100 has 120 GB more HDD capacity than the Seagate 40GB 2.5" Ultra ATA/100 (160 GB vs 40 GB). The Seagate 160GB 3.5" Ultra ATA/100 has 1,800 RPM more HDD speed than the Seagate 40GB 2.5" Ultra ATA/100 (7200 RPM vs 5400 RPM). The Seagate 160GB 3.5" Ultra ATA/100 has 1" more HDD size than the Seagate 40GB 2.5" Ultra ATA/100 (3.5" vs 2.5"). Operating voltage: 5 / 12 V on the Seagate 160GB 3.5" Ultra ATA/100, 5 V on the Seagate 40GB 2.5" Ultra ATA/100. Operating temperature (T-T): 0 - 60 °C on the Seagate 160GB 3.5" Ultra ATA/100, 5 - 55 °C on the Seagate 40GB 2.5" Ultra ATA/100.

HDD capacity
- 160GB 3.5" Ultra ATA/100:160 GB
- 40GB 2.5" Ultra ATA/100:40 GB
HDD speed
- 160GB 3.5" Ultra ATA/100:7200 RPM
- 40GB 2.5" Ultra ATA/100:5400 RPM
HDD size
- 160GB 3.5" Ultra ATA/100:3.5"
- 40GB 2.5" Ultra ATA/100:2.5"
Storage drive buffer size
- 160GB 3.5" Ultra ATA/100:2 MB
- 40GB 2.5" Ultra ATA/100:8 MB
HDD number of heads
- 160GB 3.5" Ultra ATA/100:16
- 40GB 2.5" Ultra ATA/100:2
Average latency
- 160GB 3.5" Ultra ATA/100:4.16 ms
- 40GB 2.5" Ultra ATA/100:5.6 ms
Operating voltage
- 160GB 3.5" Ultra ATA/100:5 / 12 V
- 40GB 2.5" Ultra ATA/100:5 V
Operating temperature (T-T)
- 160GB 3.5" Ultra ATA/100:0 - 60 °C
- 40GB 2.5" Ultra ATA/100:5 - 55 °C

Side by side

Differences highlightedShow differences only

Comparison of 160GB 3.5" Ultra ATA/100, 40GB 2.5" Ultra ATA/100
36 specifications	A Seagate 160GB 3.5" Ultra ATA/100 View product	B Seagate 40GB 2.5" Ultra ATA/100 View product
Features6 differ
HDD capacityDiffers	160 GB	40 GB
HDD speedDiffers	7200 RPM	5400 RPM
HDD sizeDiffers	3.5"	2.5"
Storage drive buffer sizeDiffers	2 MB	8 MB
HDD number of headsDiffers	16	2
Read seek timeKnown for one	11 ms	Unknown — not stated by the source
Write seek timeKnown for one	12 ms	Unknown — not stated by the source
Average latencyDiffers	4.16 ms	5.6 ms
Start/stop cyclesKnown for one	50000	Unknown — not stated by the source
Component forKnown for one	Unknown — not stated by the source	Laptop
Access timeKnown for one	Unknown — not stated by the source	12.5 ms
Bytes per sectorKnown for one	Unknown — not stated by the source	512
Power1 differ
Operating voltageDiffers	5 / 12 V	5 V
Power consumption (standby)Known for one	Unknown — not stated by the source	0.26 W
Power consumption (idle)Known for one	Unknown — not stated by the source	0.8 W
Power consumption (read)Known for one	Unknown — not stated by the source	1.8 W
Power consumption (write)Known for one	Unknown — not stated by the source	1.8 W
Start-up currentKnown for one	Unknown — not stated by the source	1 A
Operational conditions1 differ
Operating temperature (T-T)Differs	0 - 60 °C	5 - 55 °C
Operating relative humidity (H-H)Known for one	5 - 90%	Unknown — not stated by the source
Storage relative humidity (H-H)Known for one	5 - 95%	Unknown — not stated by the source
Operating altitudeKnown for one	-60.96 - 3048 m	Unknown — not stated by the source
Non-operating altitudeKnown for one	-60.96 - 12192 m	Unknown — not stated by the source
Operating shockKnown for one	63 G	Unknown — not stated by the source
Non-operating shockKnown for one	350 G	Unknown — not stated by the source
Weight & dimensions4 differ
WidthDiffers	101.6 mm	69.8 mm
DepthDiffers	146.9 mm	100.2 mm
HeightDiffers	26 mm	9.5 mm
WeightDiffers	580 g	100 g
Other featuresidentical
Drive devices burst data transfer rate (DMA)Known for one	2	Unknown — not stated by the source
Drive devices burst data transfer rate (PIO)Known for one	4	Unknown — not stated by the source
Drive devices burst data transfer rate (Ultra DMA)Known for one	5	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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