Back up files size change

Discussion in 'Mac Basics and Help' started by Peter Franks, Jan 16, 2012.

  1. Peter Franks macrumors 65816

    Joined:
    Jun 9, 2011
    Location:
    London UK
    #1
    Any idea when I have a folder on the MBP that says its 421MB and when I save it on an external hard drive it shows 472MB? Makes no sense at all
     
  2. robbieduncan Moderator emeritus

    robbieduncan

    Joined:
    Jul 24, 2002
    Location:
    London
    #2
    Are both drives using the same format (e.g. HFS+)?
     
  3. chown33 macrumors 604

    Joined:
    Aug 9, 2009
    #3
    What are the capacities of the two drives? Is the external much larger than the other one?

    Does the copied folder contain a large number of small files?
     
  4. belvdr macrumors 603

    Joined:
    Aug 15, 2005
    #4
    Differences in the cluster size of the filesystems is likely the culprit.
     
  5. Peter Franks thread starter macrumors 65816

    Joined:
    Jun 9, 2011
    Location:
    London UK
    #5
    thanks for replies, It's a Freecom 320GB external and MBP is 320. It doesn't happen on all, but enough, I wonder if ones' missing something or other. Format wise, don't know. Just a drag and drop is my expertise!
     
  6. Peter Franks thread starter macrumors 65816

    Joined:
    Jun 9, 2011
    Location:
    London UK
    #6
    Yes,... folder does contain a large number of small-ish files
     

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