I have an encrypted dmg (Mac OS Extended Journaled) read/write and it shows a size of of 768.46 GB unmounted but only has a mounted capacity of 665.72 GB. I think something may have been corrupted when I resized it from 500GB to 650GB. I attempted through disk utility, which proceeded to appear to freeze, so I let it go for about 15 minutes and then I checked the log and it said "resize successful". I then proceeded to check the capacity of the image mounted and it still said 500GB. So next i tried resizing through hdutil which led me to where I am now. Unmounted size of 768.46 GB but a 665.72 GB capacity. Any ideas how I could fix this?

  • 1
    Same question here, except I didn't get any "resize successful" message. Disk Utility didn't freeze either. – chharvey Nov 11 '14 at 18:23
  • Strange, I still have not found a fix – cbalos Nov 12 '14 at 6:54

I figured it out!

  1. Open Disk Utility.

  2. In the left-hand panel, select the disk image you would like to resize (the DMG file), then click the Resize Image button in the toolbar, and then enter the new size. Click Log to ensure that it resized successfully.

  3. Click Open to mount the volume. (You may also mount the volume manually by opening the disk image in the Finder.) Select the volume in the left-hand panel. Notice how the volume's Total Capacity is unchanged. This is where you got stuck.

  4. Select the disk image again (not the volume). Now there are new tabs available. Click the tab labeled Partition. This essentially allots different partitions of storage space to the disk image. Select the volume you would like to resize and drag the ... draggy thing? or manually enter in a size. Then click Apply. Check the log to ensure the partition was resized successfully.

  5. Select the volume in the left-hand panel. Check to ensure its Total Capacity is the correct size.

That's it! Now you can add more files to the volume. Remember to eject the volume when done.

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  • Wow, not sure how i missed that. Great job figuring this out. Thanks – cbalos Dec 4 '14 at 4:10

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