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The external hard drive or USB flash drive is not mounting on your Mac, you can't use Disk Utility to erase or format it. Data eraser for formatting unmounted external hard drive/USB drive on Mac After you recover or back up your data, you can follow this guide to securely format the unmounted external hard drive/USB flash drive or other device. Magoshare Data Recovery for Mac can help you recover lost data from unmounted external hard drive, from unmounted USB flash drive on Mac. How to format unmounted external hard drive, USB flash drive or other data storage device on Mac? Don't worry, here is an easy and secure solution to help you quickly format unmounted external hard drive/USB flash drive under Mac OS.įirst of all, make sure you have recovered your data from the unmounted external hard drive or USB flash drive before formatting it.
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