Any away to make it save the DB to a second harddrive....if not, any way to suggest it to the makers of avast?
Actually, there is
You can specify the path (i.e. folder) where the integrity database should be created in registry:
HKEY_LOCAL_MACHINE\Software\ALWIL Software\Avast\4.0as the value
Avast4IntegrityFolder (it's not present there by default, you'd have to create it).
Alternativelly, you can create an environment variable called
Avast4IntegrityFolder specifying the folder to store the VRBD to.