So it seems tools like Disk Drill etc can accomplish more than what Mac OS offers and it might be worth looking into if you have this issue. I tried all other options I could find, using command line, disk utility etc and this was the only thing that unblocked the situation. I think DiskDrill unblocked something.Īfter mounting, I was able to format the drive successfully. So I went back to Disk Utility that previously did not allow me to Mount the broken drive and tried to Mount again and now it worked. However, I found it interesting that DiskDrill could see content and offered me to mount the drive so I wondered if it had done something good. However I could not select mount in the Free version and could not pay 89$ for recovering a non-important drive worth 30$. When doing that, Diskdrill showed me drive content. I was not able to kill the fsck process either, it just kept going.įinally I downloaded the free version of DiskDrill and clicked on the Rebuild button. In my case it looped around the Could not repair after 3 attempts" error but then it just restarted the tests again. The drive was detected but when it is plugged in fsck starts to execute and it seems to run indefinitely. I tried booting into Single User mode and ran all the fsck commands with no success. The external drive did not show in finder. DO NOT MESS THIS UP.I had a similar issue. Then this: diskutil erasedisk is the ID of your disk.Type this very carefully (sudo might not be necessary): sudo diskutil unmountDisk force /dev/disk2.(note: be EXTREMELY careful, ask you could wipe your computer if you do this wrong)
Thankfully I ended up fixing it quickly (with a little googling). I was getting things like: ”could not modify partition map” and “couldn’t unmount disk.” Other things could be things like “couldn’t open device.” Erasing an External USB or Hard Drive that keeps failing in Disk Utility You get this error, and the details vary depending on the format type you try That might be because the disk is a Windows/Linux bootable formatted as FAT-32, which OSX cannot read.Īnd then when you try to erase in disk utility, the USB is greyed out and First Aid doesn’t work, you can’t repair it, and you can’t mount or unmount it. Are you trying to erase a USB drive on your mac but getting this error as soon as you insert it?
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