Help creating an encrypted disk image over 4.2GB in 10.6

Discussion in 'macOS' started by Warbitrary, Jan 4, 2010.

  1. Warbitrary macrumors regular

    Joined:
    Nov 24, 2009
    Location:
    Montréal, Canada
    #1
    I've been trying to create a large encrypted read/write image in Snow Leopard. I've discovered that if the disk image is over 4.19 GB, the creation process stalls forever (I waited 4h before cancelling, during which there was no progress and no disk activity). Leopard (10.5) has no problem creating large encrypted r/w images.

    Here are the settings I used:
    Format: Mac OS Extended (Journaled)
    Encryption: 128 bit AES (256 bit fails too)
    Partitions: Single Partition - Apple Partition Map (GUID fails too)
    Image Format: read/write disk image

    Different sizes I tested (128bit encryption, APM):
    4.19 GB is successful
    4.199 GB stalls after writing 1 MB to disk
    4.2 GB stalls after writing 2.1 MB
    4.3 GB stalls after writing 104.9 MB
    4.4 GB stalls after writing 207.6 MB

    I can create r/w images of any size if I remove the encryption. I can also create a sparse image of any size with encryption, but I want to create a read/write image.

    SW: Mac OS 10.6.2
    HW: Early 2006 iMac 17", Core Duo 1.83 Ghz, 2 GB RAM

    Any clue on how to create a r/w encrypted disk image over 4.19 GB in Snow Leopard?

    Thanks.
     
  2. Warbitrary thread starter macrumors regular

    Joined:
    Nov 24, 2009
    Location:
    Montréal, Canada
    #2
    Could someone at least try creating a large image to confirm it's not only my system having this problem?
     
  3. NT1440 macrumors G4

    NT1440

    Joined:
    May 18, 2008
    Location:
    Hartford, CT
    #3
    I just made a 20 GB 128 bit encrypted image yesterday no problems.
     
  4. yg17 macrumors G5

    yg17

    Joined:
    Aug 1, 2004
    Location:
    St. Louis, MO
    #4
    I created a 1TB encrypted sparseimage with no problems, took about 30 seconds to create it.
     
  5. Warbitrary thread starter macrumors regular

    Joined:
    Nov 24, 2009
    Location:
    Montréal, Canada
    #5
    Thanks, but I have no problem with sparse images. Only read/write images.
     
  6. Davewilks macrumors newbie

    Joined:
    Feb 6, 2009
    #6
    Your not trying to create it on a USB flash drive or other FAT formatted device are you?
     
  7. Warbitrary thread starter macrumors regular

    Joined:
    Nov 24, 2009
    Location:
    Montréal, Canada
    #7
    No, I'm creating it on my Mac OS Extended (Journaled) startup drive.
     

Share This Page