Hi, I still have the same problem that several people already had earlier but apparently it resolved for them. Not so for me: root@slipgate ~# cdrwtool -d /dev/scsi/host0/bus0/target0/lun0/cd -q -t 10 using device /dev/scsi/host0/bus0/target0/lun0/cd setting speed to 10 1920KB internal buffer setting write speed to 10x Settings for /dev/scsi/host0/bus0/target0/lun0/cd: Fixed packets, size 32 Mode-2 disc I'm going to do a quick setup of /dev/scsi/host0/bus0/target0/lun0/cd. The disc is going to be blanked and formatted with one big track. All data on the device will be lost!! Press CTRL-C to cancel now. ENTER to continue. Initiating quick disc blank Disc capacity is 295264 blocks (590528KB/576MB) Formatting track start=0, blocks=16, type=RESERVED start=16, blocks=3, type=VRS start=19, blocks=237, type=USPACE start=256, blocks=1, type=ANCHOR start=257, blocks=31, type=USPACE start=288, blocks=32, type=PVDS start=320, blocks=32, type=LVID start=352, blocks=32, type=STABLE start=384, blocks=1024, type=SSPACE start=1408, blocks=293568, type=PSPACE start=294976, blocks=31, type=USPACE start=295007, blocks=1, type=ANCHOR start=295008, blocks=160, type=USPACE start=295168, blocks=32, type=STABLE start=295200, blocks=32, type=RVDS start=295232, blocks=31, type=USPACE start=295263, blocks=1, type=ANCHOR Writing UDF structures to disc wait_cmd: Invalid argument Command failed: 2a 00 00 00 01 00 00 00 20 00 00 00 - sense 05.21.02 wait_cmd: Invalid argument Command failed: 2a 00 00 00 01 20 00 00 20 00 00 00 - sense 05.21.02 wait_cmd: Invalid argument Command failed: 2a 00 00 00 01 40 00 00 20 00 00 00 - sense 05.21.02 wait_cmd: Invalid argument Command failed: 2a 00 00 00 01 60 00 00 20 00 00 00 - sense 05.21.02 wait_cmd: Invalid argument Command failed: 2a 00 00 00 05 80 00 00 20 00 00 00 - sense 05.21.02 wait_cmd: Invalid argument Command failed: 2a 00 00 00 05 a0 00 00 20 00 00 00 - sense 05.21.02 wait_cmd: Invalid argument Command failed: 2a 00 00 00 05 c0 00 00 20 00 00 00 - sense 05.21.02 wait_cmd: Invalid argument Command failed: 2a 00 00 00 05 e0 00 00 20 00 00 00 - sense 05.21.02 wait_cmd: Invalid argument Command failed: 2a 00 00 00 06 00 00 00 20 00 00 00 - sense 05.21.02 wait_cmd: Invalid argument Command failed: 2a 00 00 04 80 40 00 00 20 00 00 00 - sense 05.21.02 wait_cmd: Invalid argument Command failed: 2a 00 00 04 81 00 00 00 20 00 00 00 - sense 05.21.02 wait_cmd: Invalid argument Command failed: 2a 00 00 04 81 20 00 00 20 00 00 00 - sense 05.21.02 wait_cmd: Invalid argument Command failed: 2a 00 00 04 81 40 00 00 20 00 00 00 - sense 05.21.02 Quick setup complete! root@slipgate ~# UDFtools are v 1.0.0b2, UDF module is version 0.9.6, kernel 2.4.19 (vanilla kernel with self-applied XFS, preempt, low-latency and of course Jens Axboe's packet writing patch). My CDRW device is a LiteON LTR-24102b. This occurs on every medium i use, with 650MB as well as 700MB CD-RWs, different manufacturers. I tried already quite a lot to resolve this, including different versions of both udftools and udf, different kernel versions (2.4.18 and 2.4.19), browsing the mailing list archives for patches and applying if appropriate, but nothing so far worked. When i set it up manually (cdrwtool -b, then -m and then mkudffs) the same thing happens, and it's not related to the amount of blocks used or the size of the UDF filesystem. The most important thing here to note is that it just worked 2 weeks ago. I have a UDF disk i formatted on this very machine and i still use it. Using the writer with whatsoever method trough cdrecord/cdrdao works w/o problems, the device is actually completely OK. Thanks a lot in advance for any hints. Milosz Derezynski -- UNIX - Live free or die http://www.bsd.org | http://www.linux.org Help fight TCPA/Palladium: http://www.cl.cam.ac.uk/users/rja14/tcpa-faq.html