Backup drive won't mount

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I've been using Time Machine for some time. As my MacBook Pro (2012 model) was dying, I bought at MacBook Air and used the external backup drive to put my existing data on the new machine.

The backup drive worked fine with the Air when I was transferring the data, but now it doesn't. Can't even get it to fully mount; Disk Utility shows it grayed out and won't let me run first aid on it or erase it. Is there any way to salvage this disk?
 

Cory Cooper

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Hello,

-Which brand/model is the drive?
-Is it a desktop or portable external enclosure?
-USB connection?

C
 

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