Unallocated Space is available disk space that is not allocated to any volume. The type of volume that you can create on unallocated space depends on the disk type. On basic disks, you can use unallocated space to create primary or extended partitions. On dynamic disks, you can use unallocated space to create dynamic volumes.
Unallocated space is simply defined as the area or space on the hard drive of the computer that is available to write data to.
The unallocated space is not viewable to the typical computer user and requires specialized computer forensic software to view and analyze. Unallocated space can contain deleted files or partially deleted files. When a file is deleted, the pointers to the file are removed, but the data remains in unallocated space until such time as the operating system stores another file in the same space, thereby over-writing the data.
Allocated or Active space is simply defined as the area or space on the hard drive the contains the operating system and user data (files) that are easily accessible to the computer user.
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