Mac OS X operating system enables you to divide your hard drive into several volumes, for efficient management of your critical data. A system must contain at least one startup volume. The other volumes can be non-startup volumes containing your data. Startup volume contains operating system, which is used to boot your system. Non-startup volumes are very important for the user from data point of view. In case something goes wrong with non-startup volumes, also called unmountable volume, all your data become inaccessible. This behavior leads to significant data loss and Mac data recovery becomes need of hour, if backup is not available.
When your Mac OS X hard drive gets logically damaged or it comes across any sort of errors, you can try resolving them using Disk Utility. It is an inbuilt utility of Mac OS X operating system, which checks integrity and consistency of damaged hard drive. It also fixes minor file system errors. However, this utility sometimes fails to work on non-startup or unmountable Mac OS X hard drive volumes.
When you try to verify or repair a non-startup and unmountable Mac OS X hard drive volume using Disk Utility application, the repair process appears to start, but then it is aborted. At the same time, you may come across the below error message:
“Repairing disk failed with error. Could not unmount disk.”
After the above error message, when you check the Console of Disk Utility, you see the below entries:
“Verify and Repair disk “Storage”
The disk “Storage” could not be unmounted
Could not unmount disk for verification
Repairing disk failed with error. Could not unmount disk”
In some situations, your Mac machine may not respond for a few minutes after this behavior.
If you are unable to determine which files or directories are open on your hard drive that you need to repair or verify, reboot your system and then mount your hard drive again.
To fix data loss from the damaged unmountable volume, go for data recovery Mac solutions. Mac recovery is best possible using advanced and powerful third-party applications.
The Mac recovery software use efficient scanning methods to successfully recover lost data from damaged hard drive. They are incorporated with interactive graphical user interface to provide easy recovery.
Stellar Phoenix Macintosh Data Recovery software recovers lost, deleted, missing, and inaccessible data from Mac OS X hard drive. The software works well with Mac OS X 10.6 Snow Leopard, 10.5 Leopard, 10.4 Tiger, and 10.3.9 Panther. It salvages data from HFS, HFS+, HFSX, HFS Wrapper, and FAT file system volumes.
How to Fix Damaged Non-Startup Volume in Mac OS X?