HD capacity issue.

Discussion in 'MacBook Pro' started by jinxer5000, Mar 4, 2008.

  1. jinxer5000 macrumors member

    Feb 11, 2008
    I upgraded my MBP ot teh 200GB 72oorpm HD and noticed last night that capacity was only 183.29GB. Anyone else? Thoughts. Comments.
  2. MacBookJoePro macrumors regular

    Mar 10, 2006
    Yea thats pretty normal. With all Hard drives you will not get the entire capacity out of them. This is due to translation from bits to Gigabytes and the manufacture rounding them off to advertise to the consumer. Roughly 10% is missing from what is advertised. I dunno how it works but I know thats how it is..

  3. amoda macrumors 6502a

    Aug 9, 2006
    That's due to the difference in the defenition of a GB by software and hardware compaines.

    Hardware companies: 1,000,000,000 bytes=GB
    Software: 1,073,741,824 bytes=GB

    So 1 hardware GB= .93 software GB

  4. jinxer5000 thread starter macrumors member

    Feb 11, 2008
    That's an awful lot of "rounded-off space". Ah, nevermind I get it now thanks for the replies. I never really thought to look on other machines and when I got this one I did and was confused.

    Again, Thank you all.
  5. Neil321 macrumors 68040


    Nov 6, 2007
    Britain, Avatar Created By Bartelby
    This is normal,have a read of this taken from another thread

    Hard drive manufacturers are deceptive when they label their drives.

    In the computer world, by any measurement, from any operating system, the correct way to calculate a GB as 1024^3 bytes (1024 is 2 to the 10th power, raised to the third power = 2^30) or 1,073,741,824 bytes.

    Hard drive manufacturers, however, count a GB as 1000^3 (1000 to the third power) or 1,000,000,000. "Everybody does it" is their lame excuse. AFAIK, these may be the only humans in existence* who's mothers didn't ask them, "If your friends all walked off a cliff...?"

    Anyway, if you do the math you'll see the difference is about 7% (1-(10^9/2^30)) which is almost exactly the difference you are seeing between your formatted size and what Western Digital printed on the size of the box.

    Because the terms GB or gigabyte have been so hopelessly contorted by hard drive manufacturers, a standards body has come up with a new set of unambigious terms; Gibibyte abbreviated GiB are now being used instead. While a GB could be mean 10^9 or 2^30, a GiB always means exactly 2^30 or 1,073,741,824 bytes.
  6. rezonat0r macrumors 6502

    Nov 2, 2007
    No, it's the same amount of space, but measured 2 ways. Then on top of that, there is filesystem overhead which eats into that even further.
  7. TEG macrumors 604


    Jan 21, 2002
    Langley, Washington
    A KB (as advertized) is 10^3 whereas a GiB (as formatted) is 2^10. This is basically the difference between decimal and binary. So 1K is 1000 (as advertized, whereas 1K is 1024 (in binary). As you multiply the 1024, you end up with extra bytes that they sell you on, when in reality they aren't there.


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