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  1. #1


    Member Since
    Aug 19, 2009
    Posts
    5
    How to get read/write permission on encrypted disk image
    I recently bought a Macbook Pro and am having some difficulty figuring out permissions on an encrypted disk image. Here's my situation:

    1. I partitioned an external hard drive into two parts: one is Mac OS Extended (Journaled), the other is FAT (for Windows stuff).
    2. I created a password protected disk image on the Mac partition of the external hard drive and put private files in there.
    3. After the disk image is mounted, I can access the files with no problem, but I can't delete them or move them around within the disk image or add additional files to the disk image.

    When I check the info, it says I only have read permission and I don't see a way to change that. My question: is this disk image "fixed"? In other words, am I forever prevented from modifying anything within the encrypted disk image?

    Thanks for your help!
    A new Mac user

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    48,193
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    By nature Disk Images are read only. Same as if you were trying to add files to an *.ISO, no can do. Don't use an image to store the encrypted files. If you need to protect the files, use an encryption program instead.

    Try "Truecrypt" since it's free.

    Regards.

  3. #3


    Member Since
    Aug 19, 2009
    Posts
    5
    Ah - thanks for the advice. I'll give it a shot.

  4. #4


    Member Since
    Mar 30, 2004
    Location
    USA
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    4,744
    Specs:
    12" Apple PowerBook G4 (1.5GHz)
    Quote Originally Posted by chscag View Post
    By nature Disk Images are read only.
    No. The default .dmg format is read/write.
    Same as if you were trying to add files to an *.ISO, no can do.
    Sure you can. Not sure if Disk Utility or the Finder alone can do it, but it's absolutely possible.

    Don't use an image to store the encrypted files.
    By all means, use encrypted images to store files securely, so long as you intend to access them only from other Macs.

    I would try starting over with a new .dmg first.

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