View Full Version : Huge Disc Image

04-19-2007, 03:50 AM
I have just brought a copy of SuperDuper and I am trying to create a bootable backup of my main harddrive (Intel G5 10.4.9). My drive is 250gig in size with only 30gig of data on it, but I keep ending up with a 200ishgig disc image when the drive only contains 30gig of data to backup? Any ideas, thanks in advance.

04-19-2007, 08:34 AM
Apple image management tends to not re-use free space in the image preferentially, so the image will eventually grow exteranlly, even though the internal space is smaller. It will only grow to the size of the original drive.

You can recover space in the image using hdiutil (search a bit on the board and you'll see how), or you could also use Disk Utility to create a sparse image with a much smaller maximum size and point SD! at it...

Hope that helps.

04-19-2007, 02:43 PM
Just a quick note.

If you want to boot directly from your backup you can't have the destination be a disk image. A diskimage can't be booted