A different angle on SD & Time Machine integration

[MMM]

We have a similar question. It's really the only thing that worries us about SD/Time Machine. Right now we have SuperDuper backing up to our external Firewire drive. The ext. drive is set up into partitions, and SuperDuper puts its backup into one of those partitions. The other partitions currently aren't being used. Here's our question; will we be able to tell Time Machine to put its data into one of those other partitions, or will Time Machine want to hog the entire external drive, forcing us to buy a second drive for SuperDuper. According to everything that we've read there is no way to tell Time Machine to use a specific partition on the ext. harddrive, just which 'drive' to use, and this concerns us