Product comparison · 2 internal hard drives

Seagate 250GB 3.5" SATA II vs Seagate 400GB 3.5" SATA II

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  • 27specifications compared
  • 5differ
  • 22identical
  • 0known for one product only

Key differences

The Seagate 400GB 3.5" SATA II has 150 GB more HDD capacity than the Seagate 250GB 3.5" SATA II (400 GB vs 250 GB). The Seagate 400GB 3.5" SATA II has 8 MB more storage drive buffer size than the Seagate 250GB 3.5" SATA II (16 MB vs 8 MB). The Seagate 400GB 3.5" SATA II has 0.2 ms more read seek time than the Seagate 250GB 3.5" SATA II (8.2 ms vs 8 ms).

  • HDD capacity
    • 250GB 3.5" SATA II:250 GB
    • 400GB 3.5" SATA II:400 GB
  • Storage drive buffer size
    • 250GB 3.5" SATA II:8 MB
    • 400GB 3.5" SATA II:16 MB
  • Read seek time
    • 250GB 3.5" SATA II:8 ms
    • 400GB 3.5" SATA II:8.2 ms
  • Non-operating shock
    • 250GB 3.5" SATA II:350 G
    • 400GB 3.5" SATA II:300 G
  • Weight
    • 250GB 3.5" SATA II:580 g
    • 400GB 3.5" SATA II:710 g

Side by side

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Comparison of 250GB 3.5" SATA II, 400GB 3.5" SATA II
27 specifications
Features3 differ
HDD capacityDiffers250 GB400 GB
HDD speed7200 RPM7200 RPM
HDD size3.5"3.5"
InterfaceSerial ATA IISerial ATA II
TypeHDDHDD
Storage drive buffer sizeDiffers8 MB16 MB
HDD number of cylinders1638316383
HDD number of heads1616
Read seek timeDiffers8 ms8.2 ms
Write seek time9 ms9 ms
Average latency4.16 ms4.16 ms
Bytes per sector512512
Start/stop cycles5000050000
Poweridentical
Operating voltage5 / 12 V5 / 12 V
Start-up current2.6 A2.6 A
Operational conditions1 differ
Operating temperature (T-T)0 - 60 °C0 - 60 °C
Storage temperature (T-T)-40 - 70 °C-40 - 70 °C
Operating relative humidity (H-H)5 - 90%5 - 90%
Storage relative humidity (H-H)5 - 95%5 - 95%
Operating altitude-60.96 - 3048 m-60.96 - 3048 m
Non-operating altitude-60.96 - 12192 m-60.96 - 12192 m
Operating shock63 G63 G
Non-operating shockDiffers350 G300 G
Weight & dimensions1 differ
Width101.6 mm101.6 mm
Depth147 mm147 mm
Height26.1 mm26.1 mm
WeightDiffers580 g710 g

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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