First, the slave drive needs the jumper changed to either cable select or master. Second, if this was originally a dual-boot system, you need to have a boot.ini on your root of your "slave" drive (I'm assuming there isn't one if it was dual-boot). For the scenario that your "slave" drive has XP, open notepad and paste the following:
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect
...then save as boot.ini to the root of C: