extra megabytes

Discussion in 'Mac Basics and Help' started by timelessbeing, Nov 26, 2011.

  1. timelessbeing macrumors member

    Oct 15, 2009
    I used Superduper to clone one external HD to another. After completion, I clicked "Get Info" for the two volumes. The source says Used: 989.77 GB on disk (989,768,949,760 bytes) and the destination says Used: 989.98 GB on disk (989,975,355,392 bytes). The target HD was erased before the procedure. I compared the Get Info windows for each subfolder on each HD and they exactly matched.

    What is the extra 206,422,016 bytes I am seeing? Some kind of file system overhead?
  2. simsaladimbamba

    Nov 28, 2010
    That is the partition map and some extra and important information.
    Here is how it looks in Disk Utility with my 1.5TB HDD in 10.6.8.

  3. timelessbeing thread starter macrumors member

    Oct 15, 2009
    Both HDs only have one partition. However, one has a GPT and the other has a APM. GPTs are larger? Or is it because the HD is twice as large as the other?

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