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Couldnt unmount disk mac os
Couldnt unmount disk mac os










  1. Couldnt unmount disk mac os how to#
  2. Couldnt unmount disk mac os mac#
  3. Couldnt unmount disk mac os windows#

Couldnt unmount disk mac os mac#

If erasing Mac hard drive in Local Recovery results in "Couldn't open device.: (-69877)" on Mac, you can try doing it in Internet Recovery with Option + Command + R. Use this combination to reinstall the macOS version that came with your Mac or the closest version available. Shift + Option + Command + R: Start up from Internet Recovery.Use this combination to reinstall the latest macOS compatible with your Mac. Option + Command + R: Start up in Internet Recovery.Use this combination to reinstall the lasted macOS that was installed on your Mac or other apps available in recovery. Command + R: Start up in local macOS Recovery.

Couldnt unmount disk mac os windows#

If you have or can borrow a Windows computer, you can erase the disk clean and then reformat it on Mac. If it is turned on, you can temporarily turn it off to see whether it's affecting the erasing process. In some cases, FileVault, if enabled, may cause troubles when erasing a disk. If that doesn't help, try erasing the disk again after ejecting the drive properly and replugging it. You're recommended to retry erasing the drive in Safe Mode, as it can prevent third-party extensions from loading when starting up your Mac, clear caches, and check & repair your Mac hard drive. It's possible that certain processes are using the drive, resulting in "Couldn't open device.: (-69877)" on USB flash drives or external hard drives. What else you can try is to erase the volume first and then proceed to erase the drive in Disk Utility. Suppose Disk Utility won't let you erase the drive. Choose your file system and name the disk.Select your external drive from the left side and click Erase.Click Disk Utility in the macOS Utilities window.On an Apple Silicon Mac: Shut down your Mac, then press and hold the power button until "Loading startup options" shows up. Keep pressing the two keys until seeing the Apple logo. On an Intel-based Mac: Restart your Mac, then hold down Command + R keys when the screen turns black.

couldnt unmount disk mac os couldnt unmount disk mac os

So, it's reasonable to think that the error has something to do with the failure of "Unmounting disk." In this case, you can manually unmount the disk by executing another command. If you are formatting the drive in Terminal, you'll notice that the process macOS was running before showing the "Error: -69877: Couldn't open device" error: "Unmounting disk." To change the disk's permissions on Mac, you can right-click its icon on the desktop and select "Get Info." If you are experiencing "Couldn't open device.: (-69877)" on Mac when erasing a USB flash drive, (micro) SD card, or external hard drive, you need to ensure that your account has "Read & Write" privilege to the drive.

couldnt unmount disk mac os

Couldnt unmount disk mac os how to#

How to fix 'couldn't open device 69877' on Mac when erasing an external disk? Like " Couldn't unmount disk 69888," error 69877 may be caused by the failure to unmount the disk due to it currently being used by other processes, like FileVault.īesides, "couldn't open device 69877" may also occur when you don't have write access to the drive, or the drive is physically locked or has hardware issues. There could be many reasons why the error "couldn't open device 69877" pops up on Mac. Why do you see 'couldn't open device 69877' on Mac? How to fix 'couldn't open device 69877' on Mac when erasing the internal disk? Guide to the error reading "Couldn't open device.: (-69877) on Mac: Here, we will analyze the reasons behind "couldn't open device 69877" on Mac and help you fix it with practical solutions. When erasing a disk on Mac, you may receive " Error: -69877: Couldn't open device" in Terminal or " Couldn't open device.: (-69877)" in Disk Utility.ĭespite the slightly different wording, the errors refer to the same "couldn't open device" issue, which can happen on your internal hard drive or external storage device, such as a (micro) SD card, USB flash drive, external hard drive, etc.












Couldnt unmount disk mac os