That said though - in over 30 years of using Windows I can honestly say I've never found defragging a drive has ever resulted in any significant improvement whatsoever - and these days with much larger HDD's with bigger caches fragmentation is not an issue - The OS can pre-read a lot of data into the HDD's cache which eliminates a lot of the delay with having to access all the chains in a file - the algorithms for pre-fetch and read are very sophisticated these days. With an HDD if bits of file are scattered all over the HDD then you have rotational delay to reach the bits of the file, read time etc.
SSD's don't ever need any fragmentation fixes - no moving parts - the whole disc works like a 2D array (map like the X-Y co-ordinates) so any address is just as reachable as any other in the same time frame.
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