Here's a new one for you guys. I have three sata hard drives in my primary computer. WinXp acknowledges all three. All three drives have the appropriate "total" hard disk space posted in explorer (and everywhere else for that matter). The problem is the free space. I can have, for instance, 100 gigs of free space on a drive or partition. I can create/copy a 30-gig file on to that drive or partition, delete it and explorer will show only 70-gig free disk space. Copying or creating files on to that drive or partition will continue to consume the space until space runs out. Deleting files doesn’t make a difference. I cannot recover the free disk space unless I reformat the drive or partition. I have tried performing a clean install of XP, updating the motherboard bios and updating motherboard drivers. None of which have worked so far. Any insight as to what is going on? Unless I can pinpoint the problem, I have resigned myself to the fact that a new motherboard may be the only solution. Thanks in advance for the help.