![]() ![]() 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). The inability to unmount a disk on Mac can cause various errors. ![]()
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