The above article walks you through how to use Recovery HD to erase and start over if that's your eventual goal. The reinstallation problem might be solved by erasing the storage, but that's probably a better stand alone question. I would just use Disk Utility to erase the volume and rename it Macintosh HD since that is far easier, there in the main menu of items, and doesn't need any care with spaces, quotes or messing up the disk0s2 and erasing the wrong area of the drive. umount: 0506-349 Cannot unmount /dev/backupS01: The requested resource is busy. ![]() The \ is needed to escape the space between "Macintosh HD" - quotes would work as well if you prefer that. In your example, if you want to wipe all contents on what's normally named Macintosh HD and in your case is disk0s2/Macintosh Hard Drive - you could issue the command: diskutil eraseVolume JHFS Macintosh\ HD disk0s2 noanyowners do not fail if the user invoking hdiutil cant ensure. When you boot to Recovery HD, you should also have about 15 lines of df output with devices running from disk0 to disk12 or more (it varies between OS X 10.8 and 10.11). If Disk Arbitration is not running, it can be necessary to unmount the filesystems. A couple of thing are not making sense in your description.
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