Can't write on external HDD

Discussion in 'Mac Accessories' started by Sptz, Sep 7, 2007.

  1. Sptz macrumors regular

    Aug 8, 2007
    I have an external hdd and it works normally under any pc, but on my macbook pro for some reason it says the drive is read only, and I can't backup my stuff in there... what should I do? thanks in advance
  2. MK2007 macrumors regular

    Aug 31, 2007
    How is the drive formatted? With NTFS? Very likely. OS X can only read those files, not write to them.
  3. swiftaw macrumors 603


    Jan 31, 2005
    Omaha, NE, USA
    It's very likely that if you have been using it on windows that it is formatted using NTFS formatting which is the windows standard. OSX can read NTFS formatted drives but not write to them.

    You have several choices:

    1) Reformat to FAT32 which can be read/write by both windows and osx, unfortunately FAT32 has a file size restriction of 4GB

    2) Reformat to standard mac format NFS+ which windows can read/write if you use a windows program called macdrive

    3) Connect to the drive via a network, all machines can read/write to a drive over a network no matter what the format of the drive.

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