How much minimum free disk space does JkDefrag require?
JkDefrag does not require a minimum free disk space, unlike many other defragmenters. But: • Windows reserves some space for expansion of the MFT, default is 12.5% of the volume size. This space is counted by Windows as free space because it can/will be used for regular files when the rest of the volume is full. JkDefrag cannot move files into this space, only out of (“reclaim MFT reserved space”). • A file can only be defragmented if there is a gap on disk big enough to hold the entire file. There may be plenty of free space, but what is needed is a single big gap. In these cases JkDefrag will try to reduce the number of fragments in the file by using the biggest gaps available.
