Hard drives often do run pretty warm, even hot, so that's not necessarily any indication of a fault. The click may well be an indication of wear but not necessarily responsible for the long scandisk/defragging operations. Did you deactivate your screensaver and close all other running programs before you did those ops? Anything that calls for hard drive activity will often make such checks restart endlessly and slow up the checking process immensely. All day for 20gig does seem extreme! I am wondering if your PC is running slowly for some reason and it shows up in the ways you've indicated. When you boot up and the BIOS does its memory check, does it report any errors? Do programs open or close more slowly than they used to? Have you done a virus scan? Try to verify that your PC is not working very hard behind the scenes and struggling for resources before spending money on replacing your hard drive. Could you take it out and install it in another PC to see if the same still happens? That would at least show if it's the PC or the drive that's the problem. LC.