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.
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