If, however, you get an error like “The volume Macintosh HD was found corrupt and needs to be repaired,” then you can repair the drive using diskutil as well. If you see no messages, then you can assume that diskutil hasn’t found any errors, and you can move on.
So for an external drive named “BackupStuff” you would enter:ĭiskutil verifyvolume /Volumes/BackupStuff/ Or, if you have an external drive attached, you can type or paste in the following:ĭiskutil verifyvolume /Volumes// So, for your main hard drive, you could type or paste in something like: Once launched, type or paste in the following command. Launch Terminal from your Dock, Utilities folder, or via an app launcher like Alfred. Once a removable disk has been unmounted, it can safely be disconnected from the computer.Verify and Repair Disk Permissions via Terminal (Mac OS X)ĭiskutil repairPermissions / Verify and Repair Volume via Terminal (Mac OS X) In Mac OS X, select the disk on the desktop and either drag the disk to the trash (which changes to an Eject icon), or select "File→Eject" from the Finder's menu bar. In order to unmount a disk in Windows, open "My Computer," select the disk, and click the "Eject this disk" option in the left sidebar.
Several types of disks can be unmounted, including external hard drives, USB flash drives, iPods, flash memory cards, and disk images. Therefore, before removing an external data storage device, such as a USB flash drive, the disk should be unmounted to avoid possible data corruption. Since unmounting a disk prevents the computer from accessing it, there is no risk of the disk being disconnected in the middle of a data transfer. When a disk is mounted, it is active and the computer can access its contents. Of course, in order for a disk to be unmounted, it must first be mounted. Unmounting a disk makes it inaccessible by the computer.
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