External Hard Drives not Mounting after Yosemite Upgrade

I've just upgraded to Yosemite, and none of my external (USB) hard drives are mounting (they don't even appear in Disk Utility).


Any ideas?

Posted on Oct 19, 2014 2:53 AM

Reply
41 replies

Nov 23, 2014 9:29 AM in response to The_V-Man

I don't know if anyone has mentioned this yet, but after hours of searching for an answer as to why my external hard drive did not show up on my desktop after upgrading to Yosemite, I clicked on the Finder, clicked on Preferences and under the General tab there's a section that says, "Show these items on the desktop," where I simply checked "External Drives." All is well now!

Apr 2, 2015 7:14 AM in response to Sandra Pesch

“Kext Utility” can’t be opened because it is from an unidentified developer. Your security preferences allow installation of only apps from the Mac App Store and identified developers.


go to System Preferences... Security...

there should be a message saying the app was blocked

and you can click "run anyway"


(note: technically you should have googled this, because it is basic knowledge that is off-topic for this thread)

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External Hard Drives not Mounting after Yosemite Upgrade

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