I am using the latest Retrospect Pro 7.6.123, Windows XP, fully up to date, backing up to a Maxtor OneTouch III 1 TB drive, Firewire connecton. Recently, my drive became nearly full and Retrospect simply hung the computer, no errors, no log files that I could find. So, I cleaned out the external drive, re-defined my backup sets and tried again. It is locking up again. How can I diagnose this problem? There are no error messages displayed. When I return to the computer after a backup starts, the Retrospect window is up, progress bar has moved about 10% to 30% of the way across, but nothing is happening and nothing responds, I have to warm boot the machine. i am pretty sure the drive itself is OK.