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User profile for user: rex wilson
rex wilson Author
User level: Level 1
78 points

codec overrun

I used DiskUtility to create a DMG file - a backup of my hard drive. I wrote the DMG file to a removable firewire disk. When I try to mount the DMG file, I get an error about a codec overrun.
This happens both when opening from within disk utility (which produces the message "Unable to attach disk0.dmg - codec overrun"), and also when double-clicking the DMG file and invoking diskimagemounter (which says "the following disk images failed to mount... " and also cites "codec error"),

I've searched the forums for "codec overrun" and see all kinds of messages about firewalls and bad network configurations. But has nothing to do with my network (and the same problems happen when I am totally disconnected from a network). I'm doing this using a firewire cable to a portable drive. I'm not downloading any DMG files from anywhere.

Help?

macbook pro 15" Intel Core Duo 2.33 w 23" Apple Cinema Display, Mac OS X (10.4)

Posted on Mar 31, 2007 9:45 AM

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9 replies
User profile for user: rex wilson
rex wilson Author
User level: Level 1
78 points

Mar 31, 2007 3:34 PM in response to baltwo

Many thanks for the link.
However it didn't tell me much more than that my DMG file is probably corrupted. I had just gotten finished writing the DMG file, onto a freshly-initialized firewire external drive, and after running Disk Repair and Permissions Repair on the source disk. I built the DMG file using Disk Utility, and it produced no error messages, and after writing, it did a successful verify. So I'm still at a loss as to why this newly-created DMG is producing errors upon mount.
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User profile for user: baltwo
baltwo
User level: Level 9
62,362 points

Apr 1, 2007 12:55 PM in response to rex wilson

Maybe this from MacFixIt: Disk images not mounting might help.

If you are having a problem where disk images won't mount, try booting in Safe Mode (by holding down the Shift key while starting up), then re-attempting mounting of the disk image.
This solution is particularly useful for the following scenario: You want to try re-application of the Mac OS X combo updater (a common workaround for issues that occur after an incremental Mac OS X update), but are unable to mount the combo updater disk image.
Prior to booting in safe mode, however, you can delete the following files:
• /System/Library/Extensions.kextcache
• /System/Library/com.apple.kernelcaches
and re-attempting the mount. These, and other cache files, are automatically deleted when you boot in safe mode, but you can potentially save some time by trying deletion of these files (then logging out and back in) first.
Another option is to use an alternative tool that can mount disk images, like Mount.app, FlashMount, or Toast Titanium.
Or, this from Apple: Disk image damaged
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codec overrun

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