how come a Seagate ATA 300GB harddisk only appear to be 279GB ?

Posted on 2005-04-29
Last Modified: 2010-04-03

I just purchased a SEAGATE ATA 300GB harddisk.

When I placed into my PC, wanted to format it, it appeared to be 279GB ?

is that any way , method  or utilityi can get to around 300GB .

Question by:fox404
    LVL 95

    Accepted Solution

    It is 300 GB.  Where 1 GB = 1,000,000,000 bytes.  Problem is, to the computer, 1 GB = 1,073,741,824 bytes (2 to the power of 30).  But the hard drive makers can say 300 GB which sounds better if they measure it in even numbers like 1,000,000,000 bytes.
    LVL 95

    Expert Comment

    by:Lee W, MVP
    Just for example: - multiply 1,073,741,824 by 279 "GB" and you get 299,573,968,896 - figure The computer rounds down, the drive is logically probably 279.4 GB, which is 300,003,465,625 (or so) bytes.

    Author Comment


    but why, if i boot up, in my bios, the hdd only give 135GB ?
    LVL 95

    Expert Comment

    by:Lee W, MVP
    Your BIOS may be limited to 128 GB (in computer GB, not Marketing GB).  You may need to upgrade the BIOS.

    You might also need to install a Service Pack.  What OS are you using?  XP?  2000?  XP Requires SP1 OR 2, 2000 I believe needs SP3 OR 4.  

    For more info:
    Windows 2000:

    Windows XP:

    BIOS depends on your computer brand/motherboard brand

    Maxtor related tips:

    Some outdated, but otherwise interesting info:

    LVL 95

    Expert Comment

    by:Lee W, MVP
    Can you explain why the A grade?  What part of my answer did you have a problem with?

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