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Well, after knowing the causes now, let’s start the troubleshooting process. As a result of which, you can encounter this error with your Mac device. In case, OS X Recovery exists as a partition in the physical disk then, the system becomes unable to modify or unmount the internal drive. It can also happen when the same device is being used by some other application or process. The main reason to encounter this error is the alteration of the boot drive. When you encounter this error on Mac then, you get an error message showing Error: -69877: Couldn’t Open Device. ![]() 3 Final Words Causes for Error: -69877: Couldn’t Open Device
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