Naturally by defragmenting there should be increase in free space but when I defragmented my free space decreased by 10 GB nearly why it happened? Any one over there can help me?
closed as too broad by Dave, fixer1234, DavidPostill♦, Kevin Panko, Nifle Feb 26 '15 at 18:01
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Defragmenting shouldn't effect free space that way - it simply moves files around on the disk in attempt that full files appear sequentially on the disk rather than scattered in fragments all over the disk.
Chances are, you're probably looking at the creation of temporary files, system restore points or volume shadow copies created as the result of defragmenting.