new internal hard drive not recognized

So i installed a new hitachi 100gb internal hard drive in my ibook. put OSx in and when it gets to where you want it installed, the new drive isn't there. help. Please.

Is the new drive formatted?

that's a no. how can i format it.do i just use my tiger disk?

I had the same problem. When you're in the installer, in one of the menus at the top there is a "Disk Utility." You can use that to put 1+ partitions the drive. That will format it automatically.