Back up as many of your files as possible, reformat the disk, and restore your backed-up files. This video show an alternative way to reformat and erase your SD drive when you receive the following error within the disk utility G. If you have any idea to get the HDD working or even safe the files, I would be really grateful.Īlmost forgot about this from Disk Utility:ĭisk Utility can’t repair this disk. This was the try: $ sudo diskutil eraseDisk JHFS+ DISK_VOLUME disk1īut it didn't work as well. Than for each disk: $sudo diskutil unmount force disk1snīecause I wasn't able to do anything with my external HDD I made a desperate attempt to erase everything on it, including unbackuped files, cause this used to be the backup plan. Gave this: Forced unmount of disk1 failed: at least one volume could not be unmounted Following this, attempt to Erase/Partition the drive again in Disk Utility. If I open it in disk util I sometimes see an actual name of a partition, but most likely it's not the real name.Ģ: Apple_HFS Macintosh HD 140.0 GB disk0s2ģ: Apple_Boot Recovery HD 650.0 MB disk0s3Ĥ: Microsoft Basic Data BOOTCAMP 110.1 GB disk0s4Īnd then to unmount this: $sudo diskutil unmountDisk force disk1 You can force unmount a drive by running the following Terminal command: diskutil unmountDisk force /Volumes/VOLUMENAME Replace VOLUMENAME with the name of a volume on the disk you are trying to unmount.
05 percent - I then tried to erase drive and install a fresh copy of lion - then did. Again, if the disk throwing the errors is the same as the primary boot partition that Recovery is also on, the above. I had many updates yesterday - I installed updates - for some reason finder kept shutting off, Everytime I hit send to apple - it would reappear - I tried to reinstall from Time Machine, but it kept failing at.
Go to First Aid to verify and repair the disk, or go to Erase to format the disk. If Couldnt Unmount Disk error occurs when you are trying to modify the boot drive, the easiest solution is to boot your Mac using another drive, and then run. My 1TB LaCie Rugged THB decided it was a good idea to stop working all of a sudden. Reboot the Mac holding down the Option key and choose the Recovery partition. If Couldnt Unmount Disk or erase process has failed error occurs, the simplest solution is to boot the Mac system and run Disk Utility on the disk.