Hi all I have sort of resolved it. My default distro configuration, from Slackware 9 compiles ATAPI CD-ROM support, the main SCSI support, and the ISO9660 filesystem into the kernel. I usually make these as modules, to make the kernel a little smaller and thus use less memory. If I leave these options compiled into the kernel, there is no problem. However, if they are all as modules, it doesn't work. DMA is enabled by default, and my DVD-ROM drive is set up to be mounted from /dev/cdrom which is symlinked to /dev/scd0 when using SCSI emulation, and /dev/hdc when using straight IDE. I usually have SCSI emulation set up for burning. This has never been a problem for me in previous kernel versions. I will live with it now, as I guess it is a small kernel size increase and should not change the performance in any great deal. Thanks again Luke
