Defraggler Time Taken to Defrag in Defraggler Suggestions Posted November 10 · Report reply Quote A quick defrag took 13 minutes. Windows seem to calculate % fragmentation on number of files. They gave fragmentation at 3%. Total number of files on PC is 295,000, they gave 7,900 fragmented. 7,900/295,000x100 = 2.7% Defraggler seems to consider GB, they gave 13% fragmentation - 6.9 GB out of 53.9 GB used. 6.9/53.9x100 = 12.8% After defrag, Defraggler gave 14 files @ 4.8 GB still fragmented with 48 fragments - saying it is still 9% fragmented ! 4.8/53.9x100 = 8.9% !!! IMO "number of files" is the correct basis on which to consider fragmentation, NOT GB. I will adopt Windows defrag, using "files" as the basis of fragmentation and wave goodbye to GB comparisons. To deal in file fragments and then measure the fragmentation in GB is moving the goal posts.