no man nothing..i know it sounds crazy but i have tried this many times ..i put in the old hdd my floopy drive works..i put in the new one it dosent...and there is no extra noise..just the usual......i had a funny feeling that since my new hdd was too big probably something somehow is stopping my system to use any more storage space (just a crazy idea) or is there some thing in bois settin because ther are portions like ram shadow etc. that i dont have an idea about..rest of the settings are ok..and i dont change the bios settings when i flip the disks (primary master is at AUTO)...well..any thing else