Unallocated space is logical space on a hard drive that the operating system, which can write to. On the other word, it is the opposite of “allocated” space, which is where the operating system has already written files to.
If the operating system writes a file to a certain space on the hard
drive that part of the drive is now “allocated”, as the file is using it
the space, and no other files can be written to that section. If that
file is deleted then that part of the hard drive is no longer required
to be “allocated” it becomes unallocated. This means that new files can
now be re-written to that location.
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