yeah i had a 5.1Gb quantum fireball with the exact same problem.
it wasn't so much of a problem, but just a size issue.
i remember it came up with -796Mb or something.
not actually detrimental to using the drive, just anything over 4Gb (4096MB) got shown in minus numbers.
the formatted capacity of the drive was something like 4882MB so thats 4096 + 796. so the drive shows as -796MB on HD toolbox as that is the amount that is over the 4Gb limit.
ran happily in an A4000/030 OS3.0 just with dodgy size reporting... just not really advisable to put a partition in the space after the 4Gb limit...
