Steps for macOS 10.11.x (El Capitan) and macOS 10.12.x (Sierra) Open Disk Utility. Please See Answer ID 1362: How to access Disk Utility on macOS; Click the Eject button next to the external hard drive volume (My Passport, etc) The drive will now be greyed out; Click the Erase button; Choose a new Format: Mac OS Extended (Journaled). Whether using a PC or Mac computer, your My Passport Go drive works easily right out of the box and includes automatic backup software 2 for Windows and is also Time Machine compatible for Mac backup (reformatting required).
I went to best buy and bought a new cable and the one that the guy recommended was the 'Insignia 4ft charge/sync cable' and i just connected and its till not appearing on my mac desktop. Also the drive does show on the disk utility. When I clicked 'Verify Disk' it said this: Verifying partition map for “WD My Passport 070A Media”Checking prerequisitesChecking the partition listChecking for an EFI system partitionChecking the EFI system partition’s sizeChecking the EFI system partition’s file systemChecking all HFS data partition loader spacesChecking booter partitionsChecking Core Storage Physical Volume partitionsThe partition map appears to be OK. Part 2: When I clicked 'Repair Disk' it said this: Verifying and repairing partition map for “WD My Passport 070A Media”Checking prerequisitesChecking the partition listAdjusting partition map to fit whole disk as requiredChecking for an EFI system partitionChecking the EFI system partition’s sizeChecking the EFI system partition’s file systemChecking all HFS data partition loader spacesChecking booter partitionsReviewing boot support loadersChecking Core Storage Physical Volume partitionsUpdating Windows boot.ini files as requiredThe partition map appears to be OK what does this all mean? What do I do next? Okay, so I had to fight this today, and I figured out a way to at least fix the hard drive.
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First of all, update to Sierra if you are on Mac OS. El Capitan was a pain in the a$$. Next, open the WD Disk Utility app, NOT the mac one. Select 'Erase' and then check the box on the right, NOT the left. The left will not erase first for some reason. Erase the right first, then the left.
Your hard drive is ready for war again. HOWEVER if you need to get those files off of the hard drive, do not mess around and go to a computer repair shop.
If you can, back up your important files temporarily to iCloud or some other service. Disk Warrior is supposed to work great but I didn't exactly have $100 lying around. After this is said and done, I still recommend buying another hard drive just in case.