Thanks again for all the answers! I downloaded the latest modified X-DSL (being 0.71.2). Created a bootable DVD but I can't install it natively. The HDD dows not contains any fatx partitions (probably what's screwing up native install).
I already have another Xbox with XBMC installed on it. That xbox will only be used as a NAS. My NAS Xbox has a Duox2 modchip flashed with cromwell 2.40 and gentoox loader 6.07. I see no point in wasting more than 5GB of HDD space to keep the Xbox functionnality when I have another machine just for that.
I would really be happy if there was a way to install X-DSL natively on my HDD without any fatx partitions. I would like to have only a swap partition and an ext3 partition. The ext3 partition would take the whole 2TB (minus the 256M swap) and that would be perfect to store all my files so that all my computers (and xbox with XBMC

can access them!
Thanks again for the help and answers. It is really appreciated!!!