Product comparison · 2 internal hard drives

Dell 400-18558 internal hard drive vs Seagate Momentus ST640LM020 internal hard drive

8specifications compared
4differ
4identical
23known for one product only

Key differences

The Dell 400-18558 internal hard drive has 1,800 RPM more HDD speed than the Seagate Momentus ST640LM020 internal hard drive (7200 RPM vs 5400 RPM). The Dell 400-18558 internal hard drive has 1" more HDD size than the Seagate Momentus ST640LM020 internal hard drive (3.5" vs 2.5"). HDD capacity: 1 TB on the Dell 400-18558 internal hard drive, 640 GB on the Seagate Momentus ST640LM020 internal hard drive. Operating voltage: 5 / 12 V on the Dell 400-18558 internal hard drive, 5 V on the Seagate Momentus ST640LM020 internal hard drive.

HDD capacity
- 400-18558 internal hard drive:1 TB
- Momentus ST640LM020 internal hard drive:640 GB
HDD speed
- 400-18558 internal hard drive:7200 RPM
- Momentus ST640LM020 internal hard drive:5400 RPM
HDD size
- 400-18558 internal hard drive:3.5"
- Momentus ST640LM020 internal hard drive:2.5"
Operating voltage
- 400-18558 internal hard drive:5 / 12 V
- Momentus ST640LM020 internal hard drive:5 V

Side by side

Differences highlightedShow differences only

Comparison of 400-18558, ST640LM020
31 specifications	A Dell 400-18558 internal hard drive Model 400-18558 View product	B Seagate Momentus ST640LM020 internal hard drive Model ST640LM020 View product
Features3 differ
HDD capacityDiffers	1 TB	640 GB
HDD speedDiffers	7200 RPM	5400 RPM
HDD sizeDiffers	3.5"	2.5"
Interface	Serial ATA II	Serial ATA II
Type	HDD	HDD
Component forKnown for one	Unknown — not stated by the source	Laptop
Access timeKnown for one	Unknown — not stated by the source	4 ms
Average seek timeKnown for one	Unknown — not stated by the source	12 ms
Average latencyKnown for one	Unknown — not stated by the source	5.6 ms
Hot-swapKnown for one	No	Unknown — not stated by the source
SMART technologyKnown for one	Yes	Unknown — not stated by the source
Power1 differ
Power consumption (standby)Known for one	Unknown — not stated by the source	0.2 W
Power consumption (idle)Known for one	Unknown — not stated by the source	0.7 W
Power consumption (read)Known for one	Unknown — not stated by the source	2.3 W
Power consumption (write)Known for one	Unknown — not stated by the source	2.3 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	5 - 55 °C
Storage temperature (T-T)Known for one	Unknown — not stated by the source	-40 - 70 °C
Operating relative humidity (H-H)Known for one	Unknown — not stated by the source	5 - 90%
Storage relative humidity (H-H)Known for one	Unknown — not stated by the source	5 - 95%
Operating vibrationKnown for one	Unknown — not stated by the source	1.5 G
Operating altitudeKnown for one	Unknown — not stated by the source	-300 - 3000 m
Non-operating altitudeKnown for one	Unknown — not stated by the source	-400 - 15000 m
Operating shockKnown for one	Unknown — not stated by the source	325 G
Non-operating shockKnown for one	Unknown — not stated by the source	750 G
Weight & dimensionsidentical
WidthKnown for one	Unknown — not stated by the source	69.8 mm
DepthKnown for one	Unknown — not stated by the source	100.3 mm
HeightKnown for one	Unknown — not stated by the source	9.5 mm
Packaging dataidentical
Quantity per pack	1 pc(s)	1 pc(s)
Other featuresidentical
Data transfer rate	3 Gbit/s	3 Gbit/s

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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