Article:
  An Unencrypted Look at FileVault
Subject:   Auto-expanding disk image?
Date:   2003-12-22 12:28:34
From:   anonymous2
I just tried using Disk Utility to make a sparse disk image but it doesn't automatically resize when it runs out of space. Is it possible to make an image that has this feature without using FileVault? I don't want to encrypt my entire home directory, but I do have some stuff I want encrypted and I don't like having to guess at how much space I'll need.
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  • Auto-expanding disk image?
    2003-12-26 04:34:14  anonymous2 [View]

    Regardless of how big you define them, sparse disk images only occupy as much room as is used. I just created a 10GB secure image to play with, and after formatting the image occupies 34MB initially.

    The reason you still have to specify an image size is that the structure of a disk's file system is dependant on the disk's size. Hence the image you make isn't actually "growing", rather the contents of the unused space is not saved on the host drive.
    • Auto-expanding disk image?
      2005-03-01 16:44:55  afunsten [View]

      This answer doesn't really solve the problem does it??? I have the same issue/question. Does Apple's file vault sparse image have a size limit too?