After defrag 3/4 of my HD is empty as is obvious and most files are clustered in the first 1/4 of the drive. Then there is a space of oh maybe 1.5" (see attachment) followed by a 1/8-3/16 inch bit of contiguous files after which it's white space all the way to the end of the drive. Is there a reason why those few bits of lonely contiguous files weren't placed with the other contiguous files at the left end.