Wait until the startup progress bar appears and release the keys.
Mac partition cannot unmount disk how to#
The above article walks you through how to use Recovery HD to erase and start over if that's your eventual goal. Just as the computer starts, hold down Command-R, which loads macOS Recovery. 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. 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 That allows the boot process to complete without any issues. Then expand the first partition to include the whole drive (bottom right hand corner). The benefit of the partition system is that there is no risk of overloading on the startup disk volume. In DU on the partition tab highlight the last partition and click the Minus Sign. After i boot it from original MacOs DVD i tried the following (1) Repair with Disk Utility - upon the process, two allert. It allows you to store a wide variety of data on it separately. Dear all, I am having a serious problem with my and need a help urgently.
Mac partition cannot unmount disk mac#
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). Usually, Mac hard drives are partitioned into different sections, also known as logical volumes. Repair macOS Catalina EFI partition when from Disk Utility it is not possible to complete First Aid on the disk on which that partition is located with the message 'The partition map needs to be repaired because there is a problem with the EFI partitions file system (-69766) '.
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A couple of thing are not making sense in your description.