Product comparison · 2 internal hard drives

Seagate 1000GB 3.5 vs Seagate 20.4GB 5400RPM HDD

Key differences

HDD capacity
- 1000GB 3.5:1 TB
- 20.4GB 5400RPM HDD:20 GB
HDD speed
- 1000GB 3.5:7200 RPM
- 20.4GB 5400RPM HDD:5400 RPM
Interface
- 1000GB 3.5:Serial ATA II
- 20.4GB 5400RPM HDD:Ultra-ATA/100
Read seek time
- 1000GB 3.5:8.5 ms
- 20.4GB 5400RPM HDD:9.9 ms
Write seek time
- 1000GB 3.5:10 ms
- 20.4GB 5400RPM HDD:10.9 ms
Average latency
- 1000GB 3.5:4.16 ms
- 20.4GB 5400RPM HDD:5.55 ms
Mean time between failures (MTBF)
- 1000GB 3.5:750000 h
- 20.4GB 5400RPM HDD:500000 h
Width
- 1000GB 3.5:101.6 mm
- 20.4GB 5400RPM HDD:101.8 mm

Differences highlightedShow differences only

Comparison of 1000GB 3.5, 20.4GB 5400RPM HDD
22 specifications	A Seagate 1000GB 3.5 View product	B Seagate 20.4GB 5400RPM HDD View product
Features7 differ
HDD capacityDiffers	1 TB	20 GB
HDD speedDiffers	7200 RPM	5400 RPM
HDD size	3.5"	3.5"
InterfaceDiffers	Serial ATA II	Ultra-ATA/100
Type	HDD	HDD
Storage drive buffer sizeKnown for one	32 MB	Unknown — not stated by the source
Read seek timeDiffers	8.5 ms	9.9 ms
Write seek timeDiffers	10 ms	10.9 ms
Average latencyDiffers	4.16 ms	5.55 ms
Start/stop cycles	50000	50000
Mean time between failures (MTBF)Differs	750000 h	500000 h
HDD number of cylindersKnown for one	Unknown — not stated by the source	16383
HDD number of headsKnown for one	Unknown — not stated by the source	16
Bytes per sectorKnown for one	Unknown — not stated by the source	512
Poweridentical
Operating voltage	5 / 12 V	5 / 12 V
Operational conditionsidentical
Operating temperature (T-T)Known for one	5 - 55 °C	Unknown — not stated by the source
Storage temperature (T-T)Known for one	-40 - 70 °C	Unknown — not stated by the source
Weight & dimensions2 differ
WidthDiffers	101.6 mm	101.8 mm
Depth	147 mm	147 mm
Height	26.1 mm	26.1 mm
WeightDiffers	640 g	590 g
Other featuresidentical
Sustained data rateKnown for one	115 MB/s	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.