Slack space is a part of hard of hard drive that are not fully used with the current allocated file and which may contain data from the previously deleted file of for simple word, slack space is thw wasted space from hard drive.
From the picture above, saving a 768 byte file (named User_File.txt) requires only sector 1 and
1/2 of sector 2 in the cluster. Depending on the operating system, the
remaining 256 bytes in sector 2 might be filled with 1′s or 0′s or might
simply remain intact. Both sectors 3 and 4 would not be overwritten
and are thus considered slack space.
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