Hi,
Udpcast (2.6.20.4udpcast kernel) doesn't see Dell Optiplex 320's hard drive. It uses b44 driver (network) and pata_atiixp driver. But only /dev/hda (cdrom) is found.
Thus, using SysRescCD (2.6.18.6-fd03 kernel), there isn't any trouble. Do you understand why?
Thanks!