Sometimes Defraggler aborts after defraging for a time.
Example:
I've just completed a fresh install of Vista Hm. Basic, + all updates, + drivers, + apps, + utilities (including Defraggler/CCleaner) on a Compaq CQ60 - 250 G HD, 2 G RAM.
I started Defraggler. It stated that the drive was 24% fragmented.
Defraggler ran for about 1.5 hrs..
It aborted - stating that the drive was still 19% fragmented.
On other occasions with other computers (regardless of OS versions, hard disk size or RAM amount) Defraggler will run it's course and finish it's work with 5% or less fragmentation.
Same here. Running Windows 7 64bit, 16Gb RAM with two 64Gb SSD drives in a RAID 0. PerfectDisk 12.5 is able to defrag this drive down to 0% defragmentation. Defraggler does not and leaves my drive about 29% fragmented. I have tried adjusting the setting but this does not change the results.