![]() Go to First Aid and check the disc, and then repair if necessary.Select “Disk Utility” from the boot menu (if you are using the Installer disk, open the “Utilities” menu to access the Disk Utility). ![]() Hold down the OPTION key during boot and then select the connected boot drive (usually there is an orange icon in the boot menu).Attach the USB boot drive to your Mac and restart it.You need any Mac OS X boot drive to perform this task, I used a Mavericks boot drive for this purpose, but others should work as well, whether they are install drives or just recovery drives, the most important thing is that they are bootable and a separate primary boot disk that stores the installed operating system: This is the recommended method because it should always correct the error. How to resolve a disconnect error on a USB boot drive Final note: Resolve a “Couldn’t Unmount Disk” Error in Disk Utility for Mac.FAQ: Resolve a “Couldn’t Unmount Disk” Error in Disk Utility for Mac.Benefits: Resolve a “Couldn’t Unmount Disk” Error in Disk Utility for Mac.Forcibly remove a disk from the command line in Mac OS.Use the Mac Recovery partition to fix disk utility errors.How to resolve a disconnect error on a USB boot drive.
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