If you need to back up any information on the drive, first connect your drive to a computer that does recognize the drive and transfer the data to a new storage device. Choose "Mac OS Extended (Journaled)" to use the default Mac file system format. Click the "Format" drop-down menu and select the format you want to use. Select your hard drive from the list and click the "Erase" tab. To unmount a disk in Terminal: Open Terminal. I have downloaded and installed the app Whats Keeping Me This app is quite nice. I have not launched any app neither opened any file from the disk. But my Mac stubbornly refuses and says that an application may be using the disk. Question: Q: Operation couldnt be completed. I have plugged an external disk to my Mac. Restart "Disk Utility" if you had to restart your computer to perform a repair and you still don't see your drive. Additionally, this method can be applied to Windows 7 and 8 both. You may need to restart your computer and follow the prompts to complete the repair.Ĭlick the "Finder" icon in the Dock and look for your drive in the sidebar. If the operating system already mounted the drive, an "Unmount" button displays instead.Ĭlick the "First Aid" tab and select "Repair Disk," if available. Desktop diskutil list /dev/disk0 (internal, physical): : TYPE NAME SIZE IDENTIFIER 0: GUIDpartitionscheme 1.0 TB disk0 1: EFI EFI 314.6 MB disk0s1 2: AppleAPFS Container disk1 1.0 TB disk0s2 /dev/disk1 (synthesized): : TYPE NAME. Since I cant unmount it, I cant erase it an attempted erase says it 'couldnt be unmounted because it is in use by process 717 (kextcache)' 'Couldnt unmount disk. I'm on a Mac OS Catalina trying to wipe a drive via command line. Select your hard drive, optical drive or other attached drive in the sidebar. But now Im back to a problem I had when I was in regular recovery mode before, where it says 'Failed to unmount Macintosh HD because it is currently in use'. Click "Go" and select "Utilities" from the drop-down list. Click the Scheme pop-up menu, then choose GUID Partition Map. In the sidebar, select the storage device you want to erase, then click the Erase button. Click the background to bring up the Finder menu in the the top bar. If you want to erase any other type of storage device: Double-click Disk Utility in the /Applications/Utilities folder.
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