![]() How to fix 'couldn't open device 69877' on Mac when erasing an external disk? Why do you see 'couldn't open device 69877' on Mac? ![]() 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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