![]() 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. You can also force kill the process by executing the following command.(Replace PID with your PID number.) sudo kill PID Type in the following command and hit Enter.Launch Terminal from the Applications > Utilities folder.To test whether your external hard disk is failing, you can plug it into your Mac and check its S.M.A.R.T status in Disk Utility with the steps below: But if your drive opens to empty folders or files, gets frozen on Mac, or reacts incorrectly in other ways, it may have hardware problems. If your iMac, MacBook Air, or MacBook Pro couldn't unmount disk, it more likely results from the drive being occupied by other running processes rather than a hardware failure. Fix 'couldn't unmount disk 69888' on Mac when erasing or partitioning an external disk If you see the error "Couldn't unmount disk.: (-69888)" or "Error: -69888: Couldn't unmount disk" on Mac, it usually means that you are trying to reformat, partition, or delete a volume or disk but can't because the operating system won't allow it due to the volume/disk currently being used by other applications or processes, or hardware failure. What to do if you can't unmount an NTFS drive on Mac? Fix 'couldn't unmount disk 69888' on Mac when erasing or partitioning an internal disk Guide to the error "couldn't unmount disk" on MacBook Pro and other Mac models: Here, we will analyze the error and help you resolve "couldn't unmount disk" on Mac with practical solutions. The "couldn't unmount disk" error usually comes in two forms: it reads "Couldn't unmount disk.: (-69888)" in Disk Utility and "Error: -69888: Couldn't unmount disk" in Terminal. The error occurs when you fail to erase, partition, or delete an internal or external disk or volume on Mac, including an external hard drive (SSD or HDD), USB flash drive, Time Machine backup disk, an internal fusion drive, etc. " Couldn't unmount disk 69888" is one of them, in addition to " Unable to unmount volume for repair.: (-69673). If you don’t want to proceed with partitioning the disk, click Cancel.Īfter the operation finishes, click Done.Īfter you partition a storage device, an icon for each volume appears in both the Disk Utility sidebar and the Finder sidebar.The inability to unmount a disk on Mac can cause various errors. If you want to proceed with partitioning the disk, click Continue. If a dialog appears that indicates it will take a long time to resize the startup volume, read the information in the dialog, then do one of the following: ![]() Read the information in the Partition Device dialog, then click Partition. Type a name for the volume in the Name field.įor MS-DOS (FAT) and ExFAT volumes, the maximum length for the volume name is 11 characters.Ĭlick the Format pop-up menu, then choose a file system format.Įnter the size or drag the resize control to increase or decrease the size of the volume. ![]() Note: If you click Add Volume instead, you can click the Add button to create an additional APFS volume in the container, or click Cancel to return to the Disk Utility window without making any changes to the storage device.
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