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Product comparison · 2 internal hard drives

Seagate 250GB HDD vs Seagate 40GB HD

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  • 21specifications compared
  • 18differ
  • 3identical
  • 8known for one product only

Key differences

The Seagate 250GB HDD has 210 GB more HDD capacity than the Seagate 40GB HD (250 GB vs 40 GB). The Seagate 250GB HDD has 3,000 RPM more HDD speed than the Seagate 40GB HD (7200 RPM vs 4200 RPM). The Seagate 250GB HDD has 1" more HDD size than the Seagate 40GB HD (3.5" vs 2.5"). Operating voltage: 5 / 12 V on the Seagate 250GB HDD, 5 V on the Seagate 40GB HD. Operating temperature (T-T): 0 - 60 °C on the Seagate 250GB HDD, 5 - 55 °C on the Seagate 40GB HD.

  • HDD capacity
    • 250 GB
    • 40 GB
  • HDD speed
    • 7200 RPM
    • 4200 RPM
  • HDD size
    • 3.5"
    • 2.5"
  • Storage drive buffer size
    • 8 MB
    • 2 MB
  • Average seek time
    • 8 ms
    • 12 ms
  • Average latency
    • 4.16 ms
    • 5.6 ms
  • Power consumption (typical)
    • 12.8 W
    • 2.4 W
  • Power consumption (idle)
    • 7.2 W
    • 0.97 W

Side by side

Differences highlightedShow differences only
29 specifications
A

Seagate

250GB HDDView product
B

Seagate

40GB HDView product
Features6 differ
HDD capacityDiffers250 GB40 GB
HDD speedDiffers7200 RPM4200 RPM
HDD sizeDiffers3.5"2.5"
InterfaceUltra-ATA/100Ultra-ATA/100
TypeHDDHDD
Component forKnown for oneLaptop
Storage drive buffer sizeDiffers8 MB2 MB
HDD number of headsKnown for one2
Average seek timeDiffers8 ms12 ms
Average latencyDiffers4.16 ms5.6 ms
Bytes per sector512512
Track to track seek timeKnown for one0.8 ms
Start/stop cyclesKnown for one50000
Power4 differ
Power consumption (typical)Differs12.8 W2.4 W
Power consumption (standby)Known for one0.36 W
Power consumption (idle)Differs7.2 W0.97 W
Power consumption (read)Known for one2.4 W
Power consumption (write)Known for one2.4 W
Operating voltageDiffers5 / 12 V5 V
Start-up currentDiffers2.8 A1.2 A
Operational conditions4 differ
Operating temperature (T-T)Differs0 - 60 °C5 - 55 °C
Storage temperature (T-T)Differs-40 - 70 °C-40 - 65 °C
Operating shockDiffers63 G225 G
Non-operating shockDiffers300 G800 G
Weight & dimensions4 differ
WidthDiffers101.8 mm69.8 mm
DepthDiffers147 mm100.2 mm
HeightDiffers26.1 mm9.5 mm
WeightDiffers635 g99 g
Other featuresidentical
Mac compatibilityKnown for oneNo

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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