Product comparison · 2 internal hard drives

Seagate Desktop HDD ST3250824A-RF internal hard drive vs Seagate Constellation ST91000642SS-RF internal hard drive

25specifications compared
16differ
9identical
11known for one product only

Key differences

The Seagate Desktop HDD ST3250824A-RF internal hard drive has 1" more HDD size than the Seagate Constellation ST91000642SS-RF internal hard drive (3.5" vs 2.5"). The Seagate Constellation ST91000642SS-RF internal hard drive has 56 MB more storage drive buffer size than the Seagate Desktop HDD ST3250824A-RF internal hard drive (64 MB vs 8 MB). The Seagate Desktop HDD ST3250824A-RF internal hard drive has 8 more HDD heads than the Seagate Constellation ST91000642SS-RF internal hard drive (16 vs 8). HDD capacity: 250 GB on the Seagate Desktop HDD ST3250824A-RF internal hard drive, 1 TB on the Seagate Constellation ST91000642SS-RF internal hard drive. Operating voltage: 5 / 12 V on the Seagate Desktop HDD ST3250824A-RF internal hard drive, 5 V on the Seagate Constellation ST91000642SS-RF internal hard drive.

HDD capacity
- Desktop HDD ST3250824A-RF internal hard drive:250 GB
- Constellation ST91000642SS-RF internal hard drive:1 TB
HDD size
- Desktop HDD ST3250824A-RF internal hard drive:3.5"
- Constellation ST91000642SS-RF internal hard drive:2.5"
Storage drive buffer size
- Desktop HDD ST3250824A-RF internal hard drive:8 MB
- Constellation ST91000642SS-RF internal hard drive:64 MB
HDD number of heads
- Desktop HDD ST3250824A-RF internal hard drive:16
- Constellation ST91000642SS-RF internal hard drive:8
Read seek time
- Desktop HDD ST3250824A-RF internal hard drive:11 ms
- Constellation ST91000642SS-RF internal hard drive:7.5 ms
Write seek time
- Desktop HDD ST3250824A-RF internal hard drive:12 ms
- Constellation ST91000642SS-RF internal hard drive:8.5 ms
Operating voltage
- Desktop HDD ST3250824A-RF internal hard drive:5 / 12 V
- Constellation ST91000642SS-RF internal hard drive:5 V
Start-up current
- Desktop HDD ST3250824A-RF internal hard drive:2.6 A
- Constellation ST91000642SS-RF internal hard drive:2 A

Side by side

Differences highlightedShow differences only

Comparison of ST3250824A-RF, ST91000642SS-RF
36 specifications	A Seagate Desktop HDD ST3250824A-RF internal hard drive Model ST3250824A-RF View product	B Seagate Constellation ST91000642SS-RF internal hard drive Model ST91000642SS-RF View product
Features6 differ
HDD capacityDiffers	250 GB	1 TB
HDD sizeDiffers	3.5"	2.5"
InterfaceKnown for one	Unknown — not stated by the source	SAS
Storage drive buffer sizeDiffers	8 MB	64 MB
HDD number of headsDiffers	16	8
Read seek timeDiffers	11 ms	7.5 ms
Write seek timeDiffers	12 ms	8.5 ms
Mean time between failures (MTBF)Known for one	Unknown — not stated by the source	1400000 h
HDD number of cylindersKnown for one	16383	Unknown — not stated by the source
Start/stop cyclesKnown for one	50000	Unknown — not stated by the source
Power2 differ
Power consumption (typical)Known for one	Unknown — not stated by the source	6.35 W
Operating voltageDiffers	5 / 12 V	5 V
Start-up currentDiffers	2.6 A	2 A
Operational conditions4 differ
Operating temperature (T-T)Differs	0 - 60 °C	5 - 60 °C
Operating relative humidity (H-H)Differs	5 - 90%	5 - 95%
Operating vibrationKnown for one	Unknown — not stated by the source	0.5 G
Non-operating vibrationKnown for one	Unknown — not stated by the source	3 G
Operating shockDiffers	63 G	70 G
Non-operating shockDiffers	350 G	400 G
Weight & dimensions4 differ
WidthDiffers	101.6 mm	69.8 mm
DepthDiffers	147 mm	100 mm
HeightDiffers	26.1 mm	15 mm
WeightDiffers	580 g	200 g
Other featuresidentical
Data transfer rateKnown for one	Unknown — not stated by the source	4.69 Gbit/s
InternalKnown for one	Unknown — not stated by the source	Yes
Plug and PlayKnown for one	Unknown — not stated by the source	Yes
Compatible productsKnown for one	PCs	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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