Encrypted disk image mount error

Question

When I try to open one particular encrypted disk image, a Warning dialog box opens with the following message:
The disk image you are opening may be
damaged and could damage your system.
Are you sure you want to open this disk image?
If I answer yes, the image mounts and I can see at least the one file I tried.
I don't want to risk ruining the contents of the disk image, so I am not using
it anymore, and have run Disk Utility/First Aid on it.
By running this script while Disk Utility "Repairs Disk":
{ while [ 1 ]; do ps axlwww >> psout; sleep 1; done; }
I can see that Disk Utility runs:
/sbin/fsck_hfs -y -f -g /dev/disk1s2
to check a mounted disk image. This works fine on a good encrypted disk image,
but Disk Utility shows these errors for the broken one:
A Warning dialog box opens with the following message:
First Aid failed
Disk Utility stopped repairing "Safe" because the
following error was encountered:
The underlying task reported failure on exit
and the first aid window shows:
Verify and Repair disk "Safe"
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Invalid sibling link
Volume check failed.
Error: The underlying task reported failure on exit
1 HFS volume checked
1 volume could not be repaired because of an error
Any ideas how to fix this? I tried running
/sbin/fsck_hfs -y -f -r /dev/disk1s2
from the terminal, but it complains:
** /dev/rdisk1s2
** Checking HFS Plus volume.
** Checking Extents Overflow file.
** Checking Catalog file.
** Cannot repair volume when it is mounted with write access.
** The volume Safe could not be repaired.
and running it on the parent .dmg file doesn't work at all.
Thanks,
Scott

Answer 1

Well, I wish you luck, but haven't seen many people fix busted images.