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So about a week ago I used the disk Utility to make a few images of some folders in my MacBook pro as a backup (1 small with docs, one about 15GB with miscellaneous stuff and 1 about 265 GB full of photos, jpg and raw). After they were successful and mounted. I put them in an external SSD and formatted my Mac...
Today I try to get some of those into my newly formatted Mac and surprise, the two big images cannot be mounted because they are corrupted.
I attempted to use the Disk Utility to either analyse, convert or resize and it also complains about the image being corrupted.
I did a quick search around and attempted to use hdiutil to force mount, ignore some flags etc, but it would not mount complaining of the same thing diutil: convert failed - corrupt image
Then I found something that looked promising:
hdiutil attach -nomount -noverify -noautofsck -readwrite /volumes/"name of your image"
fsck_hfs -drfy /dev/diskxsx (x is your disk number)
hdiutil detach /dev/diskxsx (x is your disk number)
But that command fails with hdiutil: attach failed - Operation not permitted even when using sudo.
I then tried again with the -debug flag and got
DIResolveURLToDiskImage: resolving disk image format failed. 107.
I hope somebody has any idea how to get these images back to life.
Minoru Tsuru
Posted 2019-03-19T18:26:57.067
Reputation: 1
Did you test they were OK when you first moved them to your storage medium? [afaik, .dmg will checksum on 'open' but you'd have to rely on the storage medium being OK until then.] i've no idea how to recover one that will not pass checksum, I'm afraid. – Tetsujin – 2019-03-19T18:36:16.857
Yeah, actually now that i think about it, i created the images directly on the SSD and they were good. – Minoru Tsuru – 2019-03-19T19:26:19.063