ocr: Before running a defrag program (whether it is commercial or shareware), iti is a VERY good idea to back-up your entire hard disk. It isn't that the programs are unreliable, but they are performing a very complex task by moving all of your data around and you can never be too safe. DO NOT INTERRUPT a defrag program while it is in progress. This means no re-booting, no turning off of the power,...Mothing. A defrag program is constantly re-organizing important internal file allocation tables and to suddenly interrupt this process could be disastrous. Some defrag programs lisplay a message on the ...