Click First Aid then hit Run to verify and repair logical issues with the hard drive.

Open Disk Utility then select the hard drive from the sidebar.

Open Disk Utility then select the greyed out hard drive from the sidebar.

Mount the external hard drive from Disk Utility. Read Case Study: Whooping 94% data recovered from unmounted external drive on MacBook Pro

Swap the hard drive with a different case if you presume it to be faulty.

Check the LED light to ensure the storage device is powered on and working.

Connect external power source if the hard drive requires one.Replace the USB cable or adapter in case you suspect it to be damaged.Connect the hard drive to a different USB port or a different Mac.Reconnect the USB connector or adapter to fit the hard drive snugly.Fix External Hard Drive Connectivity IssueĮnsure proper connectivity of your external hard drive to your Mac. For MacBook Air, MacBook Pro, or MacBook with non-removable battery-press and hold Shift + Control + Option + Power Button for 10 seconds.ģ.For iMac, Mac Pro/mini, or laptop with a removable battery-detach the power cable or take out the battery then press and hold the Power button for 5 seconds.Reset SMC (System Management Controller) on your Mac. Restart Mac then immediately press and hold Option + Command + P + R keys until you hear a second chime.Reset NVRAM (Non-volatile RAM) & PRAM (Parameter RAM). Your Finder sidebar will now show the external hard drive. Under the Locations section, select the “ External disks” checkbox. Your Desktop will now show the external hard drive icon. Under the “Show these items on the Desktop” section, select the “ External disks” checkbox.On the “Finder Preferences” window, click the General tab.From the top Menu Bar, go to Finder > Preferences. The contained files and the external drive’s integrity comes to a stake.ĭon’t worry, read and apply the below fixes to resolve Mac unmounted external drive issue.Įnsure Finder preference to show external disks on Desktop or Finder is enabled. Consequently, data inside the unmounted external hard drive turns inaccessible.

But sometimes the external drive won’t appear on any of these places. When you connect an external hard drive on Mac, it will show up on Desktop, Finder, and Disk Utility. Free evaluate the best Mac external drive recovery software from the below. It also shares a reliable software-based method to recover data from unmounting (or un-mountable) USB hard drive on Mac. This blog explains five best ways to resolve the 'external hard drive not mounting' issue on Mac.

Resetting mac disc drive