i`ve had the same problem even with smaller drives. I connected my 4g caviar to pc with system partition as pfs3 and work as sfs and all i could do was to copy files using sfssalv. It worked, fortunately... The problem may be on the winuae`s side: it simply may have problems adressing the drive size, it may assign different drive geometry, thus, give the drive some fewer blocks it should. I think if I created a partition smaller by some megs, it would become visible. I have no way to check it, because i`m out of harddrives...