![]() Open Start, search for Command Prompt, then select "Run as administrator.".Note down the number of your external disk, such as disk 1.Press Command + R, type diskmgmt.msc into the box and hit Enter.Connect the Mac drive to the Windows computer.Here's how to erase the Mac-compatible drive on Windows: ![]() If you happen to have a Windows computer available, you can format the external hard drive, USB, or Time Machine backup disk that's experiencing "couldn't unmount disk 69888" on it, then initialize the drive on Mac with the desired file system. If you receive "Error: -69888: Couldn't unmount disk" when attempting to merge two diversely-formatted partitions, you need to decide on the preferred file system and reformat the different partition with it before merging them.įor instance, if one is formatted as APFS and the other Mac OS Extended, you can first format the Mac OS Extended partition to APFS, then merge the two partitions. Ensure two partitions are using the same file system before merging Suppose the "MacBook Pro couldn't unmount disk" issue persists proceed with other solutions below. ![]() To learn more about the process, you can open Activity Monitor and sort the PID number to find them. ![]()
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