Product comparison · 2 internal hard drives

Seagate 640GB 3.5'' SATA II vs Seagate Momentus 7200.3 320GB

15specifications compared
11differ
4identical
19known for one product only

Key differences

HDD capacity
- 640GB 3.5'' SATA II:640 GB
- Momentus 7200.3 320GB:320 GB
HDD size
- 640GB 3.5'' SATA II:3.5"
- Momentus 7200.3 320GB:2.5"
Interface
- 640GB 3.5'' SATA II:Serial ATA II
- Momentus 7200.3 320GB:Serial ATA
Storage drive buffer size
- 640GB 3.5'' SATA II:32 MB
- Momentus 7200.3 320GB:16 MB
Start/stop cycles
- 640GB 3.5'' SATA II:50000
- Momentus 7200.3 320GB:600000
Mean time between failures (MTBF)
- 640GB 3.5'' SATA II:750000 h
- Momentus 7200.3 320GB:500000 h
Operating voltage
- 640GB 3.5'' SATA II:5 / 12 V
- Momentus 7200.3 320GB:5 V
Width
- 640GB 3.5'' SATA II:101.6 mm
- Momentus 7200.3 320GB:69.8 mm

Side by side

Differences highlightedShow differences only

Comparison of 640GB 3.5'' SATA II, Momentus 7200.3 320GB
34 specifications	A Seagate 640GB 3.5'' SATA II View product	B Seagate Momentus 7200.3 320GB View product
Features6 differ
HDD capacityDiffers	640 GB	320 GB
HDD speed	7200 RPM	7200 RPM
HDD sizeDiffers	3.5"	2.5"
InterfaceDiffers	Serial ATA II	Serial ATA
Type	HDD	HDD
Component forKnown for one	Unknown — not stated by the source	Laptop
Storage drive buffer sizeDiffers	32 MB	16 MB
HDD number of headsKnown for one	Unknown — not stated by the source	4
Read seek timeKnown for one	Unknown — not stated by the source	11 ms
Write seek timeKnown for one	Unknown — not stated by the source	13 ms
Average latencyKnown for one	Unknown — not stated by the source	4.17 ms
Bytes per sectorKnown for one	Unknown — not stated by the source	512
Start/stop cyclesDiffers	50000	600000
Mean time between failures (MTBF)Differs	750000 h	500000 h
Power1 differ
Power consumption (standby)Known for one	Unknown — not stated by the source	0.21 W
Power consumption (idle)Known for one	Unknown — not stated by the source	0.75 W
Power consumption (read)Known for one	Unknown — not stated by the source	2.1 W
Power consumption (write)Known for one	Unknown — not stated by the source	2.1 W
Operating voltageDiffers	5 / 12 V	5 V
Start-up currentKnown for one	Unknown — not stated by the source	1 A
Operational conditionsidentical
Operating temperature (T-T)Known for one	Unknown — not stated by the source	0 - 60 °C
Storage temperature (T-T)Known for one	Unknown — not stated by the source	-40 - 70 °C
Operating shockKnown for one	Unknown — not stated by the source	350 G
Non-operating shockKnown for one	Unknown — not stated by the source	1000 G
Weight & dimensions4 differ
WidthDiffers	101.6 mm	69.8 mm
DepthDiffers	147 mm	100.5 mm
HeightDiffers	26.1 mm	9.5 mm
WeightDiffers	380 g	110 g
Other featuresidentical
Data transfer rate	3 Gbit/s	3 Gbit/s
Disks included quantityKnown for one	Unknown — not stated by the source	2 pc(s)
Drive device, transfer rateKnown for one	Unknown — not stated by the source	80 MB/s
Internal	Yes	Yes
Maximum data transfer rateKnown for one	Unknown — not stated by the source	300 Mbit/s
Acoustic pressure emissionsKnown for one	Unknown — not stated by the source	2.3 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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