Product comparison · 2 internal hard drives

Seagate 120GB 3.5" SATA II vs Seagate 250GB 3.5" SATA

26specifications compared
9differ
17identical
6known for one product only

Key differences

The Seagate 250GB 3.5" SATA has 130 GB more HDD capacity than the Seagate 120GB 3.5" SATA II (250 GB vs 120 GB). The Seagate 250GB 3.5" SATA has 6 MB more storage drive buffer size than the Seagate 120GB 3.5" SATA II (8 MB vs 2 MB). The Seagate 120GB 3.5" SATA II has 0.6 A more start-up current than the Seagate 250GB 3.5" SATA (2.6 A vs 2 A). Interface: Serial ATA II on the Seagate 120GB 3.5" SATA II, Serial ATA on the Seagate 250GB 3.5" SATA.

HDD capacity
- 120GB 3.5" SATA II:120 GB
- 250GB 3.5" SATA:250 GB
Interface
- 120GB 3.5" SATA II:Serial ATA II
- 250GB 3.5" SATA:Serial ATA
Storage drive buffer size
- 120GB 3.5" SATA II:2 MB
- 250GB 3.5" SATA:8 MB
Start-up current
- 120GB 3.5" SATA II:2.6 A
- 250GB 3.5" SATA:2 A
Non-operating shock
- 120GB 3.5" SATA II:350 G
- 250GB 3.5" SATA:300 G
Width
- 120GB 3.5" SATA II:101.6 mm
- 250GB 3.5" SATA:101 mm
Depth
- 120GB 3.5" SATA II:147 mm
- 250GB 3.5" SATA:146 mm
Height
- 120GB 3.5" SATA II:26.1 mm
- 250GB 3.5" SATA:26 mm

Side by side

Differences highlightedShow differences only

Comparison of 120GB 3.5" SATA II, 250GB 3.5" SATA
32 specifications	A Seagate 120GB 3.5" SATA II View product	B Seagate 250GB 3.5" SATA View product
Features3 differ
HDD capacityDiffers	120 GB	250 GB
HDD speed	7200 RPM	7200 RPM
HDD size	3.5"	3.5"
InterfaceDiffers	Serial ATA II	Serial ATA
Type	HDD	HDD
Storage drive buffer sizeDiffers	2 MB	8 MB
HDD number of cylinders	16383	16383
HDD number of heads	16	16
Average latency	4.16 ms	4.16 ms
Bytes per sectorKnown for one	Unknown — not stated by the source	512
Start/stop cycles	50000	50000
Read seek timeKnown for one	8 ms	Unknown — not stated by the source
Write seek timeKnown for one	9 ms	Unknown — not stated by the source
Power1 differ
Power consumption (standby)Known for one	Unknown — not stated by the source	0.8 W
Power consumption (idle)Known for one	Unknown — not stated by the source	6.9 W
Operating voltage	5 / 12 V	5 / 12 V
Start-up currentDiffers	2.6 A	2 A
Operational conditions1 differ
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 shockDiffers	350 G	300 G
Weight & dimensions4 differ
WidthDiffers	101.6 mm	101 mm
DepthDiffers	147 mm	146 mm
HeightDiffers	26.1 mm	26 mm
WeightDiffers	580 g	635 g
Other featuresidentical
Windows operating systems supported	Yes	Yes
Linux operating systems supported	Yes	Yes
Acoustic pressure emissionsKnown for one	Unknown — not stated by the source	3.4 dB

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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