I have a 2TB hard drive, disk utility is showing unmounted. There are many important documents stored on it, how to repair unmountable disk in Mac computer so that I can access these documents again?
There are several ways to repair unmountable disk in Mac computer.
Solution 1: Repair unmountable disk Mac with disk utility
Mac OS X operating system built-in tool: disk utility has the ability to repair unmountable disk. Disk Utility can repair common disk issues, ranging from corrupt directory entries to files left in unknown states, usually from power outages, forced restarts, or forced application quits.
We can find disk utitily in Utilities from Application folder. After opening disk utility, please select unmountable disk and then click First Aid. Fist Aid can check the volume for errors and then repair the volume if necessary. After reparing with disk utility, the unmountable disk will be mountable, but sometimes, disk untility cannot repair unmountable disk Mac. In this situation, the best way is to recover data from unmountable drive and then reformat it.
Solution 2: Repair unmountable disk Mac with the 3rd-party tool
There are three tools (Same as disk utility) which can repair unmountable disk in Mac computer, but they still fail to repair unmountable disk in some situations.
Stellar Volume Repair - Repair volume errors, rebuild corrupted volume directory, repair disk permissions and corrupted external hard drive.
Alsoft DiskWarrior - A disk repair and recovery tool resolves existing disk damage by rebuilding your disk directory using data recovered from the original directory, thereby recovering files and folders that you thought were lost.
FSCK command - Like the Disk Utility, FSCK command is also an inbuilt feature of Mac OS X, but it is a command line based utility. You can have a try and run this command on the terminal in order to repair unmountable disk.
However, these disk repair tool still fails to repair unmountable disk in some situations, so data recovery from unmountable disk is still the best way.
Solution 3: Recover data from unmountable disk
M3 Data Recovery is a free data recovery software which can recover data from unmountable, unreadable, unrecognized, corrupted, formatted disk and recover deleted files even if emptied Mac trash in macOS 10.12 and Mac OSX 10.11/10.10/10.9/10.8/10.7/10.6.
Tutorial to recover data from unmountable disk with M3 Mac Data Recovery
Step 1: Download and install M3 Mac Data Recovery on your Mac computer.
Step 2: Connect unmountable disk to your Mac computer and then run M3 Mac Data Recovery.
Step 3: Select "In a specific volume" or "In a specific hard drive" option.
Step 4: M3 Mac Data Recovery is scanning the lost data from unmountable disk.
Step 5: Select the fould data and then click Recover to save them.