I've been trying out FD-ISR. An amazing program, and what looks to be an invaluable tool. I haven't tried frozen snapshots yet. Haven't felt the need to, and after reading some posts by Erik Albert, I figure I'll wait as I'm still learning the ins and outs of First Defense. I did have two questions: I've read some good things about Software Pursuits, but have found little on Horizon DataSys. Does anyone have any have experience with these companies re: support and responding to inquiries in a timely fashion? Also, I'm thinking of getting Perfect Disk. I know that Raxco's PD would automatically exclude it's own resell of FD-ISR from defragging. I'm not sure if it will do the same if it comes from one of the other two companies. Not really a problem. I read (in another of EA's posts) that the file to exclude was C:\$ISR\0\$ISRBIN. That's the only one, right? Thanks in advance.