Tecra S1 bios detection

Hello

I have a problem with a new DVD-RW unit ( http://www.pioneerelectronics.com/pna/v3/pg/product/details/0,,2076_310070061_302357597,00.html ) witch I just install on my Toshiba Tecra S1 notebook.

The problem is that the bios doesn’t detect the DVD unit. I have the latest BIOS update but the problem it’s the same. I put the HDD in slave… and no change. I start the laptop without the HDD and still the bios didn’t “see” the DVD-RW unit.
Please help me with this problem.

Thank you !