Hi, Here's something that's been stumping me: Our DVD drive (Plextor 708A) can read and mount CDroms and it can play CD-Audio, but it can't read or write DVDs (anything that tries to use it gives a "no medium found" error). $ mount /dev/cdrom mount: No medium found similar error message with k3b... The problem is not playing DVDs with xine or anything like that - I can't get the drive to even acknowledge there's anything in it. Some computer info: Dual Opteron (tyan thunder mobo) SATA hard drives (western digital) Fedora 2 planetccrma setup: $ uname -r 2.6.7-1.437.1.ll.rhfc2.ccrmasmp (using this kernel for now because cdburning in other newer kernels hardlocks the system -- through 2.6.8.1... haven't tested past that) here's something from /var/log/messages I get when I put in a DVD: Nov 30 12:07:30 madking kernel: hda: packet command error: status=0x51 { DriveReady SeekComplete Error } Nov 30 12:07:30 madking kernel: hda: packet command error: error=0x44 Nov 30 12:07:30 madking kernel: ATAPI device hda: Nov 30 12:07:30 madking kernel: Error: Hardware error -- (Sense key=0x04) Nov 30 12:07:30 madking kernel: Tracking servo failure -- (asc=0x09, ascq=0x01) Nov 30 12:07:30 madking kernel: The failed "Read Cd/Dvd Capacity" packet command was: Nov 30 12:07:30 madking kernel: "25 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 " the corresponding dmesg lines: cdrom: open failed. hda: packet command error: status=0x51 { DriveReady SeekComplete Error } hda: packet command error: error=0x44 ATAPI device hda: Error: Hardware error -- (Sense key=0x04) Tracking servo failure -- (asc=0x09, ascq=0x01) The failed "Read Cd/Dvd Capacity" packet command was: "25 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 " cd drive info: cdrecord -scanbus when run as user: scsibus0: 0,0,0 0) 'PLEXTOR ' 'DVDR PX-708A ' '1.04' Removable CD-ROM 0,1,0 1) * 0,2,0 2) * 0,3,0 3) * 0,4,0 4) * 0,5,0 5) * 0,6,0 6) * 0,7,0 7) * when run as root: scsibus0: 0,0,0 0) '' '' '' Disk 0,1,0 1) * 0,2,0 2) * 0,3,0 3) * 0,4,0 4) * 0,5,0 5) * 0,6,0 6) * 0,7,0 7) * scsibus1: 1,0,0 100) '' '' '' Disk 1,1,0 101) * 1,2,0 102) * 1,3,0 103) * 1,4,0 104) * 1,5,0 105) * 1,6,0 106) * 1,7,0 107) * $ cat /proc/sys/dev/cdrom/info CD-ROM information, Id: cdrom.c 3.20 2003/12/17 drive name: hda drive speed: 40 drive # of slots: 1 Can close tray: 1 Can open tray: 1 Can lock tray: 1 Can change speed: 1 Can select disk: 0 Can read multisession: 1 Can read MCN: 1 Reports media changed: 1 Can play audio: 1 Can write CD-R: 1 Can write CD-RW: 1 Can read DVD: 1 Can write DVD-R: 1 Can write DVD-RAM: 0 Can read MRW: 1 Can write MRW: 1 Can write RAM: 1 hdparm info: $ hdparm /dev/hda /dev/hda: HDIO_GET_MULTCOUNT failed: Invalid argument IO_support = 3 (32-bit w/sync) unmaskirq = 1 (on) using_dma = 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead = 256 (on) HDIO_GETGEO failed: Invalid argument $ hdparm -tT /dev/hda /dev/hda: read() failed: Input/output error Timing buffered disk reads: read() failed: Input/output error Not sure what other info to give. I don't have much of a way to troubleshoot the problem by process of elimination - I have a Pioneer drive that I can try later today... we have another box with the same kernel, but it's a P4 and uses IDE drives. My instinct is that it's some kind of conflict between IDE and SCSI, but it could be a problem with the 64-bit processors (using x86, though, not x86_64, which is not available on planetccrma yet) or it could be an smp thing (if it's not the drive) -- lame segfaults on the opteron box but not on the P4 box, so I think that is probably a 64bit/smp issue, and so this DVD problem could be similar. I will try the other drive later today and see if it makes a difference. Thanks, Matt

Our DVD drive (Plextor 708A) can read and mount CDroms and it can play CD-Audio, but it can't read or write DVDs (anything that tries to use it gives a "no medium found" error). $ mount /dev/cdrom mount: No medium found