![]() ![]() Since TransMac allows you to run its full features without charge for 15 days, you can basically use it for free. If you're not confident with the command lines, you can use a tool like TransMac to format the drive with APFS/HFS+/HFS on Windows directly. Otherwise, open Disk Utility to erase it. If a pop-up asks you to initialize the disk, click Initialize to format it in Disk Utility.Plug the empty and uninitialised disk into Mac.Close the Command Prompt window when you see "DiskPart succeeded in cleaning the disk.".Type in the following command and hit Enter to wipe out the drive.(Replace disknumber with your external drive's number.) select disk disknumber Type in the following command and hit Enter to select your external drive to clean.(Double-check your external drive's disk number.) list disk Type in the following command and press Enter to list all active drives.Type in the following command and hit Enter to launch DiskPart.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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