"Fragment of unmovable file" freezes defragmentation at XX% in Defraggler Bug Reporting Posted June 21, 2011 I've ran into the same problem with defraggler 2.5/2.1, which I had ages ago with the version 1.20 (see "Defragmenting (0%)" forever). The problem details: 1) The drive has ~25% of free space. 2) Windows XP SP3 32-bit. 3) Lenovo B550 with 320 GB drive. The defragmentation was running just fine up to 60%, where it stuck for a long time and didn't moving forward... The process loads both CPU cores up to ~50%. Restarting defraggler, rebooting the system don't help - the process sticks at the same location. The log file (generated with /debug key) is attached.