Missing disk space

Discussion in 'macOS' started by pjcurtin08, Mar 26, 2010.

  1. pjcurtin08 macrumors newbie

    Joined:
    Dec 6, 2008
    #1
    Hello All,

    I have a strange issue. I recently wiped my computer using the disk utility and did a clean install of snow leopard. Then, I realized the person I was selling the computer to wanted Leopard because of compat. issues. So, in the snow leopard disk utility (boot up from disk), I deleted the partition, and it showed I had 320GB of free space. So, I boot up to Leopard DVD, and it says I have 300GB of free space. What could the problem be here, I haven't even installed Leopard yet, but its only showing I have 300GB...

    Thanks,
    Patrick
     
  2. TEG macrumors 604

    TEG

    Joined:
    Jan 21, 2002
    Location:
    Langley, Washington
    #2
    320GB as the drive is labeled is 320,000,000,000 - whereas the computer will report it as less than 300x2^30 = 322,122,547,200.

    TEG
     
  3. spinnerlys Guest

    spinnerlys

    Joined:
    Sep 7, 2008
    Location:
    forlod bygningen
    #3
    Snow Leopard uses the decimal system to show HDD space, so 320.000.000.000 bytes are shown as 320GB, but Leopard uses the binary system so 320.000.000.000 bytes are 298GB.

    320.000.000.000 / 1024 / 1024 / 1024 = 298

    2^10 = 1024
     
  4. MacDawg macrumors P6

    MacDawg

    Joined:
    Mar 20, 2004
    Location:
    "Between the Hedges"
    #4
    Check out the Guide here at MR: Hard Drive Size Discrepancy

     
  5. pjcurtin08 thread starter macrumors newbie

    Joined:
    Dec 6, 2008
    #5
    Okay, so the sizes are equal. But, what will happen when I get down to low disk space. Will there be an extra 20GB available?
     
  6. spinnerlys Guest

    spinnerlys

    Joined:
    Sep 7, 2008
    Location:
    forlod bygningen
    #6
    No, there will be no extra 20GB available.

    When Snow Leopard (10.6) shows 100GB free, Leopard (10.5) will show 93GB free.

    10.6: 20GB
    10.5: 18.6GB


    10.5: 20GB
    10.6: 21.47GB


    The actual disk space is the same, just the reporting of it differs. But the lower the free disk space the lower is the difference between the two reporting methods.
     
  7. cube macrumors G5

    Joined:
    May 10, 2004

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