Disk Utility - Restoring a previous image

Since I first bought my Mac Mini (February of this year) I've been using the disk utility to make occasional backups (disk images) of my partitions, in case I ever need to restore a whole partition (or create a clone of an existing partition - for example, so that I could test some new software that might cause problems). I've never actually needed to restore a partition (or produce a clone from one of the backup images) until today. However, when I first bought my Mac I did test this feature and it seemed to work.
A few days ago I realised that I'd soon need to clone a partition so I backed up my Mac HFS partition which is about 90GB in size (my internal disk being 500GB). I then used Coriolis iPartition to create a new, empty Mac HFS partition of the same size, then tried to use Apple's Disk Utility to restore the newly created disk image. However when I came to try the restore, I got an error saying that the image would first need to be "image scanned" before being usable. I then tried an old image that I created when I first bought the Mac and currently, that one seems to be restoring.
AFAIK I've used the same method to create both images so why did the old one work when the new one didn't??
Message was edited by: johne53

Hmmm.... I've just realised that none of the images I've created recently will verify properly. They all get to the end of the first stage (block checksum of partition #1) and then fail with "internal error". The only one which passes the verification process is the very first one which I created a long time ago. That one seems to complete two stages of block verifications (for 2 partitions) then one "file checksum".
If I try to select a disk image and use "Open Disk Image" (from the right-click menu) I get an error saying "Unable to attach [image-name].dmg. No mountable file systems." This happens with every disk image I've created, apart from the very first one.

Similar Messages

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    Message was edited by: Randy Vose

    Randy Vose wrote:
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    Make a "Genius" appointment at an Apple Store, or go to another authorized service provider. You may have to leave the machine there for several days.
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    <Image Edited by Host>
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