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I never understood how the placement method of PD worked in conjunction with the free space consolidation idea. Does it move the frequently modified files to the beginning of the drive and the rarely modified files to the end of the drive, leaving a large block of free space in the middle? Or does it bunch up all the files towards the beginning of the drive, but the order in which they are arranged is such that the most frequently modified are at the very beginning to provide the performance boost from faster access times?
No the opposite - all files are pushed to the start of the drive so that a large contiguous block is left at the end of the drive. Static files are placed first where they sit and don't need to be defragmented again in the future. Rarely modified files are placed next and at the end of the block (usually surrounding the MFT and pagefile if present which are placed in the middle of the partition) so that they can grow and it minimizes fragmentation. Finally folders are placed - and this seems to make sense to me as they change frequently and defragment very quickly when required.
Here is a display of a defragged partition on my system - as you can see it is rather full - and would probably cause DK headaches!
Re. DK "Set it and forget it" - yes I know they have that but I found it really frustrating as you could never predict when the system would start chuntering away. If you deal with large files (DVD images and video spring to mind) you can find your self filling up discs rapidly with fragmented files and then halfway through a time critical process DK suddenly decides it is time to defrag. The best automatic defrag to my mind is screen saver mode which is supported in both DK and PD.
Re. MFT expansion ... actually DKs method sounds good but there are two problems: firstly, if you expand the MFT you end up with a block of wasted space on your disc permanently; secondly, that isn't a problem if the disc has loads of free space but as the disc fills Windows automatically uses empty MFT space to write files - so you just end up fragmenting the MFT and the enlarged MFT you chose is lost.






on how the two PD and DK have different approaches to the defrag process.
(Maybe you should PM me about this?)...