partition problem

[erik freaks]

please help me when I try to install freebsd 6.2(when make partition) I got
this message:

"No disk found ! Please verify that the disk controller is being probed
properly during boot time"

please help me my Motherboard is Asus P4P8X, harddisk IDE Samgsung 160Gb,
I connected my Harddisk on Primary Master, its detected in BIOS
how to solve this problem plesase help me