Installing Tiger on a new hard drive

I recently intsalled a 300gb hard drive in my computor and I got disk utility to recognize the full capacity by installing Speedtools ATA hi-cap support driver. But when I try to install the OS, it won't let me. So then I tried the option "erase and install" and Tiger installed just fine but now reads the hard drive as 128gb total. I've tried everything I can think of to get around this obstacle, but I'm obviously doing something wrong. please help this is very frustrating.