Hard Drive Capacity

Discussion in 'Macintosh Computers' started by killuminati, Jun 11, 2005.

  1. killuminati macrumors 68020

    killuminati

    Joined:
    Dec 6, 2004
    #1
    I have two macs that are both BTO. I got my powerbook with an 80Gb HD, and an iMac with a 250Gb HD. My powerbook says that the hard drive capacity is only 74Gb and my iMac says that its capacity is only 233Gb.

    So, my question is what happened to all the missing GB?!?
     
  2. mad jew Moderator emeritus

    mad jew

    Joined:
    Apr 3, 2004
    Location:
    Adelaide, Australia
    #2
    Mainly the difference between bits and bytes from memory. Plus a little space for formatting maybe?
     
  3. Platform macrumors 68030

    Platform

    Joined:
    Dec 30, 2004
    #3
    Formatting takes a bit.........but most of it is marketing.....

    In One GIGABYTE there is 1024MB not 1000......so that is how...and the bigger the HDD there more you loose ;)
     
  4. reh macrumors 6502a

    Joined:
    Oct 24, 2003
    Location:
    Arkansas
    #4
    Because there's a discrepancy between how your OS measures drive space and how hard drive manufacturers and computer companies measure drive space.

    It all boils down to the following:
    1 Kilobyte = 1024 bytes (well established in computer speak)
    1 Kilobyte = 1000 bytes (according to drive manufacturers looking to inflate apparent drive sizes)

    If you search I'm sure you'll find about 200 threads about this.
     
  5. killuminati thread starter macrumors 68020

    killuminati

    Joined:
    Dec 6, 2004
    #5
     
  6. mad jew Moderator emeritus

    mad jew

    Joined:
    Apr 3, 2004
    Location:
    Adelaide, Australia
    #6

    Thanks for that. I didn't realise it boiled down to that. :eek:



    I thought the same thing but I haven't been able to find one yet. There was one recently where the explanation was almost as concise as reh's and I was trying to find it but no luck. :(
     
  7. killuminati thread starter macrumors 68020

    killuminati

    Joined:
    Dec 6, 2004
    #7
    Yea, I couldn't find any either or I wouldn't have posted. I wasn't even able to find one with MRoogle ;)
     
  8. reh macrumors 6502a

    Joined:
    Oct 24, 2003
    Location:
    Arkansas
    #8
    Here's a formula to convert "retail size" to "actual size." This assumes that the manufacturer is using 1GB = 1,000,000,000 bytes (instead of 1GB = 1,073,741,824 bytes as they should).

    Actual Drive Size = Retail Drive Size * 0.931

    This formula is an approximation. Many times they'll round the drive size somewhat, but this gives you a rough idea of the real world space.
     
  9. killuminati thread starter macrumors 68020

    killuminati

    Joined:
    Dec 6, 2004
    #9
    Thanks for that. I just tried that formula for a few different drives and that seems to be about right. It was never off by more than 1 gig.
     
  10. StarbucksSam macrumors 65816

    StarbucksSam

    Joined:
    Nov 21, 2004
    Location:
    Washington, D.C.
    #10
    I've found that a good general rule is to subtract 10%. I know on my old iMac's 60GB it was 55.89 or approx 7% lower.

    On this 60GB it's 55.77 - same range.
     

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