I defragmented a 3.3 TB Highpoint 2220 PCI RAID and after 8 hours it finished and my drive was not mountable. Apple Disk Utility wouldn't touch the drive and even trusty Disk Warrior rebuilt the drive but with almost everything missing 'cept for 1 folder with about 30 files in it. I'm off to use Data Rescue II to get my data off. I should a stuck to iDefrag, my bad, this utility caused me a lot of pain and most likely a data loss....thanks for the crap utility with a dumb-ass gui that makes no sense and utilities that don't show you what they are doing till the damage is done. And if anyone writes about "MAC DOESNT NEED TO BE DEFRAGMENTED" They are ignorant or don't have 10,000 VOB files and DV files that size from 300 meg to 10 gig each. My volumes are always very badly fragmented and if i don't defrag once a month and my drive crashes there is no way to recover fragmented files on a HFS filesystem. Any file over 20 meg has the chance to be fragmented, and anything over 300 gig is almost always fragmented. Luckily I used idefrag a few weeks ago so I hope 95% of my drive was already defragmented so i should be able to get those files 100% recovered, and i just hope the other 5% weren't to badly damaged / fragmented.