28Gb Loss on 400Gb Drive from format? Sector Testing?

By IPEX computing
Nov 14, 2006
  1. Hi

    I have just purchased a 400Gb HDD, unfortunalty refurbished, which the seller claims was fully tested.
    After putting the Hard drive into my computer i noticed that that drive was only reading about 380928Mb which works out at 372Gb. I contacted the seller and he insists that the drive will loose a lof of space when formatted. I know quite a bit about computers and i have never come across a hard drive that looses 28Gb of space from a format. I know Hard drives are never exactly what they say but i thought that this was too much.
    In case i am wrong here are the details of the Hard Drive.
    SEAGATE 400gb Barracuda 7200rpm....8mb Cache

    I would also like to carry out a Sector Test on the Drive. How do i go about this.

    James Davies
    IPEX Computing
  2. Mictlantecuhtli

    Mictlantecuhtli TS Evangelist Posts: 4,919   +10

    It's just marketing. The storage device manufacturers sell kilobytes as 1000 bytes, megabytes as 1000000, gigabytes as 10^9. It makes the devices look bigger.

    Computers count kilobytes as 1024 bytes, megabytes as 1,048,576 bytes, gigabytes as 1,073,741,824 bytes.

    400 * 10^9 / 1,073,741,824 = 372.529 GB.
  3. Rick

    Rick TechSpot Staff Posts: 6,308   +52

    Here's a reasonably complete list of diagnostic utilities. Check out the Manufacturer diagnostics, all of which test sectors outside of Windows. (only good way to do it. ;))
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