Forced or unintentional formatting of data: Unknowingly deleting some system files or data files can result in data loss or faulty disk error.
Interrupting Read/Write operations: In the hurry of working or accessing the data, sudden interruption in the system process can result in data loss or data corruption.
Human error: Deleting or formatting the files or data improperly in between the ongoing operations can cause disk error. The other reasons for 'Couldn't Unmount Volume' error are: The causes of this error are several, starting with the abrupt shutdown and inconsistent file system. What causes the 'Couldn't Unmount Volume' error? Usually, the error 'Couldn't Unmount Disk' shows up when you try to format, partition, verify or repair internal disk by Disk Utility on Mac system. Unmounting a disk means disconnecting a disk drive or optical disk from the computer. To know about the solutions, first, let's understand about unmounting and disk utility, and the causes of the disk error. Part 1- What does "couldn't unmount disk" mean? Part 4 - Learn, "How to Use Disk Utility?". 
Part 3 - Recover lost files on Mac after all methods fail. Part 2 - 4 methods to fix "Couldn't Unmount Disk" on Mac. Part 1 - What does' couldn't unmount disk mean?.
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