I've been having an issue lately where my main hard drive seems to be losing free space where it will gradually drop over time, going from some 50 gigs to 1 gig. My second installed drive also seems affected, saying this morning it had 545 gigs free and then dropped to zero in the course of two hours and the computer froze. Restart fixed this and it jumped back to 545. I attached an external drive with 200 gigs free and it also dropped to zero at one point but again came back randomly. I'm not saving files or running any big programs. I'm baffled. Any help would be very appreciated!