Hi, a problem examination on cdwrite mailing list yielded that the default timeout of wodim with DVD+R DL media and command RESERVE TRACK does not suffice for some drives.
A failed run with SCSI log is posted at http://lists.debian.org/cdwrite/2010/11/msg00045.html The decisive part of the log is: > Executing 'reserve track' command on Bus 2 Target 0, Lun 0 timeout 40s > CDB: 53 00 00 00 00 00 0C 65 40 00 > Errno: 5 (Input/output error), reserve track scsi sendcmd: retryable error > CDB: 53 00 00 00 00 00 0C 65 40 00 > status: 0x0 (GOOD STATUS) > cmd finished after 43.701s timeout 40s > wodim: Cannot open new session. I now got the confirmation from Zhang Weiwu that wodim succeeds on the problematic drive if option timeout=200 is given. Actually timeout=45 would have sufficed. The successful run logs > Executing 'reserve track' command on Bus 2 Target 0, Lun 0 timeout 200s > CDB: 53 00 00 00 00 00 0C 65 40 00 > cmd finished after 43.458s timeout 200s It seems that the Linux kernel did not interrupt the long running command but just indicated error afterwards. So a short timeout seems not to be of much benefit anyway. -------------------------------------------------------------------- Another flaw that showed up: wodim silently ignores option -multi with DVD+R DL. If it cannot keep the media open then it should refuse to start with -multi. Keeping a DVD+R appendable is just a matter of sending CLOSE TRACK SESSION Close Function 010b rather than 100b or 101b. wodim sends Close Function 100b which works fine, > Executing 'close track/session' command on Bus 2 Target 0, Lun 0 timeout 1000s > CDB: 5B 00 04 00 00 00 00 00 00 00 > cmd finished after 117.955s timeout 1000s and then Close Function 101b which fails: > Executing 'close track/session' command on Bus 2 Target 0, Lun 0 timeout 1000s > CDB: 5B 00 05 00 00 00 00 00 00 00 > Errno: 5 (Input/output error), close track/session scsi sendcmd: no error > CDB: 5B 00 05 00 00 00 00 00 00 00 > status: 0x2 (CHECK CONDITION) > Sense Bytes: 70 00 05 00 00 00 00 0A 00 00 00 00 24 00 00 00 > Sense Key: 0x5 Illegal Request, Segment 0 > Sense Code: 0x24 Qual 0x00 (invalid field in cdb) Fru 0x0 It appears that only one of these two should be applied. 100b does not apply to single layer DVD+R. -------------------------------------------------------------------- Have a nice day :) Thomas -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
