Product comparison · 2 internal hard drives

Seagate 40GB 3.5" SATA II vs Seagate Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100

18specifications compared
15differ
3identical
18known for one product only

Key differences

The Seagate 40GB 3.5" SATA II has 1,800 RPM more HDD speed than the Seagate Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100 (7200 RPM vs 5400 RPM). The Seagate 40GB 3.5" SATA II has 1" more HDD size than the Seagate Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100 (3.5" vs 2.5"). The Seagate Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100 has 6 MB more storage drive buffer size than the Seagate 40GB 3.5" SATA II (8 MB vs 2 MB). Interface: Serial ATA II on the Seagate 40GB 3.5" SATA II, Ultra-ATA/100 on the Seagate Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100. Operating voltage: 5 / 12 V on the Seagate 40GB 3.5" SATA II, 5 V on the Seagate Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100.

HDD speed
- 40GB 3.5" SATA II:7200 RPM
- Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100:5400 RPM
HDD size
- 40GB 3.5" SATA II:3.5"
- Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100:2.5"
Interface
- 40GB 3.5" SATA II:Serial ATA II
- Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100:Ultra-ATA/100
Storage drive buffer size
- 40GB 3.5" SATA II:2 MB
- Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100:8 MB
HDD number of heads
- 40GB 3.5" SATA II:16
- Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100:1
Average latency
- 40GB 3.5" SATA II:4.16 ms
- Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100:5.6 ms
Start/stop cycles
- 40GB 3.5" SATA II:50000
- Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100:600000
Operating voltage
- 40GB 3.5" SATA II:5 / 12 V
- Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100:5 V

Side by side

Differences highlightedShow differences only

Comparison of 40GB 3.5" SATA II, Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100
36 specifications	A Seagate 40GB 3.5" SATA II View product	B Seagate Momentus 5400.3 40 GB 5400 rpm Ultra ATA/100 View product
Features7 differ
HDD capacity	40 GB	40 GB
HDD speedDiffers	7200 RPM	5400 RPM
HDD sizeDiffers	3.5"	2.5"
InterfaceDiffers	Serial ATA II	Ultra-ATA/100
TypeKnown for one	HDD	Unknown — not stated by the source
Storage drive buffer sizeDiffers	2 MB	8 MB
HDD number of cylindersKnown for one	16383	Unknown — not stated by the source
HDD number of headsDiffers	16	1
Read seek timeKnown for one	14 ms	Unknown — not stated by the source
Write seek timeKnown for one	16 ms	Unknown — not stated by the source
Average latencyDiffers	4.16 ms	5.6 ms
Start/stop cyclesDiffers	50000	600000
Component forKnown for one	Unknown — not stated by the source	Laptop
Bytes per sectorKnown for one	Unknown — not stated by the source	512
Power2 differ
Operating voltageDiffers	5 / 12 V	5 V
Start-up currentDiffers	2.8 A	1 A
Power consumption (standby)Known for one	Unknown — not stated by the source	0.2 W
Operational conditions2 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)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 shockDiffers	63 G	350 G
Non-operating shockDiffers	350 G	900 G
Weight & dimensions4 differ
WidthDiffers	101.6 mm	69.8 mm
DepthDiffers	147 mm	100.2 mm
HeightDiffers	26.1 mm	9.5 mm
WeightDiffers	580 g	98 g
Other featuresidentical
Windows operating systems supportedKnown for one	Yes	Unknown — not stated by the source
Linux operating systems supportedKnown for one	Yes	Unknown — not stated by the source
Dimensions (WxDxH)Known for one	Unknown — not stated by the source	69.85 x 100.2 x 9.5 mm
Drive device, transfer rateKnown for one	Unknown — not stated by the source	100 MB/s
External power adapterKnown for one	Unknown — not stated by the source	No
InternalKnown for one	Unknown — not stated by the source	Yes
USB poweredKnown for one	Unknown — not stated by the source	No

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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