Disk Utility: How to Restore Failure Could Not Validate Source?
I had backed up an older G4 with a disk image of the boot disk. I had severe problems, so I reformatted the boot drive and started a restore (using disk utility from the startup disk). The restore started fine and ran for a while but then 'stalled.' The 'progress' bar stopped, and the system kept hitting the Utility DVD install disk non-stop (as shown by the disk access light). When I try again, I immediately get a 'Restore Failure - Could not validate source - error 254.'
Best Answered by
Jaden· Answered on Oct 29, 2024
"Restore Failure Could Not Validate Source" is a common error users encounter when restoring a disk image (.dmg or .iso) to a USB drive or external hard drive using Disk Utility in macOS. If you lose data or DMG files during the process, remember to use data recovery software - EaseUS Data Recovery Wizard for Mac to recover them.
Here's how you can fix this issue:
-
Open Terminal on your Mac (you can find it under Utilities or by searching for it using Spotlight).
- Convert the .iso file to .img using the 'hdiutil' command. For example: hdiutil convert -format UDRW -o /path/to/target.img /path/to/source.iso
- Replace '/path/to/target.img' with the path where you want to store the converted file.
- This command will create a .img file with a .dmg extension (like target.img.dmg).
- You need to remove the .dmg extension. You can do this with the following command: mv /path/to/target.img.dmg /path/to/target.img
- Find the device identifier for your USB drive. You can use the following command: diskutil list
You should see a list of all your drives. Your USB drive should be something like /dev/disk2, /dev/disk3, etc.
- Unmount the USB drive using the following command (replace 'X' with your disk number): diskutil unmountDisk /dev/diskX
- Now, copy the .img file to your USB drive using the following command (again, replace 'X' with your disk number): sudo dd if=/path/to/target.img of=/dev/rdiskX bs=1m
Once the process is complete, your USB drive should be ready to use.
Use EaseUS Data Recovery Wizard to recover deleted or lost files easily and quickly.
Tutorials on how to recover lost, deleted, or formatted data from HDD, SSD, USB, SD card, or other storage media on Windows and Mac.
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