Sometimes a specific disk image in OS X will automatically mount if a file on it is targeted by the system. Here are some methods for fixing this issue.

In order to back them up, Time Machine has to copy the disk image file. If you make any change to the contents of a disk image, the entire file winds up copied to Time Machine.

Find out what's taking up space on your Mac and learn the best ways to free up disk space and increase the storage available on your Mac.

Next, open the disk image file for the deleted user's home folder. The DMG file should start with the user's name. For example, 'greta.dmg'.