Help with XBpartitioner 1.3.

I just cloned a 1TB HDD with Chimp 261812 on a TSOP flashed Xbox. The cloning worked fine, although it split the remaining space evenly between the F and G partitions, when I wanted it to put everything on just F. I don't know if it's actually better to have both F and G, but I'd prefer having everything in one place.

I've cloned numerous 250GB HDDs before and never had to use XBpartitioner with those, so this is my first time using it and I'm not entirely sure what to do.

When I set it to put all space on F, it says it will be using 64KB clusters. I'm new to this, so I'm not sure what that means, or if it should be 32KB clusters, which is what it said while F and G were split. Also, it says "ER" next to the available space for F (924.06 GB) instead of saying "64." Is that some kind of error message?