Is this normal?

Discussion in 'Mac Basics and Help' started by runplaysleeprun, Oct 4, 2007.

  1. runplaysleeprun macrumors 6502a

    runplaysleeprun

    Joined:
    Jul 27, 2004
    Location:
    Chicago, IL
    #1
    I just backed up a few of my apps to my external drive, but they show a different size on the two drives, one is 302.2 MB, and the other 364.1, but I just copied it over.

    They both list the same number of bytes, though. Is it due to the different formating of the external drive (FAT32)?
     

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  2. jellomizer macrumors 6502

    jellomizer

    Joined:
    Sep 12, 2006
    Location:
    Upstate NY
    #2
    I would say Yes.
    These are different file systems, So they use different methods of storing the Data. They normally group data in fixed size segments, different file systems use different size segments so if you say have a 1k segment vs. a 2k segment. And you have a file that is 1.2k it will actually take up 2k worth of space. So this is normal for the sizes to be a bit differently... And I bet if you copy it back to the same file system they will be the same size agian.
     
  3. itickings macrumors 6502a

    itickings

    Joined:
    Apr 14, 2007
    #3
    Yes. FAT32 wasn't really intended for as large drives as we have today.

    While it technically supports them (we're nowhere near FAT32's theoretical limits yet), each file will in general waste much more space than modern file systems, and for very small files, the waste will be several times the file's size.

    For a more technical explanation, look up "cluster size" or check http://www.pcguide.com/ref/hdd/file/partSlack-c.html for ideas.
     
  4. runplaysleeprun thread starter macrumors 6502a

    runplaysleeprun

    Joined:
    Jul 27, 2004
    Location:
    Chicago, IL
    #4
    wow, that is a lot of wasted HD space. I only didn't format that drive HFS+ so I could (If I ever needed to) use it with Windows as well. I didn't realize I'd be losing approx. 1/5 of my space to writing inefficiencies.

    bummer.
     
  5. itickings macrumors 6502a

    itickings

    Joined:
    Apr 14, 2007
    #5
    Besides from wasting space, you can't have individual files larger than 4GiB in FAT32, and may run into problems with filenames, permissions and stuff.

    So, for small files you will lose lots of space, and for large file, well, you can't have them...
     

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