I have two drives, on a home-built WinXP system: a 120gb SATA system drive and a 20gb IDE backup drive. I backup my docs, quicken, etc. to the 20gb drive. There's only about 4 gb of data on it. However, twice now I've gotten a "low drive space" balloon message from XP. I go in and check properties and the 20gb drive will be at like 19.1 gb full. I check the contents, including hidden files, and like I said there's only 4gb of stuff on there. I've even run Eraser and re-formatted it, still does it. I'm not really sure what the source of such an even would be, why its filling up or what is filling it up. My only though is to wipe it and re-partition it and cross my fingers. Suggestions?