Yuggy

Sorry follks for thinking that Piriform had something to do with that... I found out that my power supply is failing, my 5 volt is about 4.5, so the usb disk did not have enough juice to start anymore Thanks to Alan_B idea, tried it on a second computer, disk worked fine so i added a transformer for my external disk and it's fine now. To answer hazelnut, i ran speccy to do the inventory of my pc contents because i had to calculate the power supply needs for my new Asus p9x79 pc Asus calculator told me that i needed at least 900W with the number of drives i actually have and my actual power supply is only 450W. Thanks to all for your help

Drive makes a bzzz... bzzz... noise every second when plugged, Windows disk manager does not see it anymore. How could I try to fix that???

IMPORTANT WARNING Had defraggler 2.1 running in background low priority on 80Gb usb external disk and ran speccy 1.16 to check my disks list. speccy froze in hard disk section... Tryed to close speccy without success... Got xp blue screen of death & reboot. Tryed to run speccy in debug mode and it froze without a log. 80Gb external disk usb 2.0 completely dead & unrecognisable by windows xp. WARN USERS NOT TO USE BOTH PGMS AT SAME TIME... IT COULD COST THEM A DRIVE LIKE ME.