Product comparison · 2 internal hard drives

Seagate 120GB 3.5" SATA II vs Seagate 40GB 3.5" SATA II

28specifications compared
4differ
24identical
0known for one product only

Key differences

The Seagate 120GB 3.5" SATA II has 80 GB more HDD capacity than the Seagate 40GB 3.5" SATA II (120 GB vs 40 GB). The Seagate 40GB 3.5" SATA II has 6 ms more read seek time than the Seagate 120GB 3.5" SATA II (14 ms vs 8 ms). The Seagate 40GB 3.5" SATA II has 7 ms more write seek time than the Seagate 120GB 3.5" SATA II (16 ms vs 9 ms).

HDD capacity
- 120GB 3.5" SATA II:120 GB
- 40GB 3.5" SATA II:40 GB
Read seek time
- 120GB 3.5" SATA II:8 ms
- 40GB 3.5" SATA II:14 ms
Write seek time
- 120GB 3.5" SATA II:9 ms
- 40GB 3.5" SATA II:16 ms
Start-up current
- 120GB 3.5" SATA II:2.6 A
- 40GB 3.5" SATA II:2.8 A

Side by side

Differences highlightedShow differences only

Comparison of 120GB 3.5" SATA II, 40GB 3.5" SATA II
28 specifications	A Seagate 120GB 3.5" SATA II View product	B Seagate 40GB 3.5" SATA II View product
Features3 differ
HDD capacityDiffers	120 GB	40 GB
HDD speed	7200 RPM	7200 RPM
HDD size	3.5"	3.5"
Interface	Serial ATA II	Serial ATA II
Type	HDD	HDD
Storage drive buffer size	2 MB	2 MB
HDD number of cylinders	16383	16383
HDD number of heads	16	16
Read seek timeDiffers	8 ms	14 ms
Write seek timeDiffers	9 ms	16 ms
Average latency	4.16 ms	4.16 ms
Start/stop cycles	50000	50000
Power1 differ
Operating voltage	5 / 12 V	5 / 12 V
Start-up currentDiffers	2.6 A	2.8 A
Operational conditionsidentical
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 altitude	-60.96 - 3048 m	-60.96 - 3048 m
Non-operating altitude	-60.96 - 12192 m	-60.96 - 12192 m
Operating shock	63 G	63 G
Non-operating shock	350 G	350 G
Weight & dimensionsidentical
Width	101.6 mm	101.6 mm
Depth	147 mm	147 mm
Height	26.1 mm	26.1 mm
Weight	580 g	580 g
Other featuresidentical
Windows operating systems supported	Yes	Yes
Linux operating systems supported	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.

More internal hard drive comparisons

All internal hard drive comparisons