Partitioning a disk for dual boot

My system disk failed last week. The media just stopped holding a proper magnetic charge so I ended up with loads of bad blocks.

The disk was 120 GB in size.

I replaced it with a 500 GB model. But I didn't need the extra space for the system disk so I partitioned it into 2 drives (Mac OS Extended). The first one I set to 185 GB and the second one I made 300 GB. The rest of the space was lost due to rounding.

I restored the 185 GB partition from my backup copy (Retrospect 5) and was quite satisfied with the results - Mac OS 9.2.2. I also was able to access the other (empty) partition successfully.

I booted the system into 9.2.2 from partition #1 and decided to install OS X on the larger partition. So I loaded up the Tiger Install disk #1. The install process started but when I was asked to select a target drive the empty second partition was not in the list of choices.

Why?

I want to have a dual boot capability on the single drive. How do I do that?

Gary