Hi, Martin McCormick wrote: > Here is the output from a normal music CD. > track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 0 mode: 0 > track: 2 lba: 19142 ( 76568) 04:17:17 adr: 1 control: 0 mode: 0
These are audio tracks. No filesystem. Neither ISO 9660 nor UDF. > track: 17 lba: 351017 ( 1404068) 78:02:17 adr: 1 control: 4 mode: 1 > track:lout lba: 351785 ( 1407140) 78:12:35 adr: 1 control: 4 mode: -1 Number 17 is a data track. Not overly normal for music CDs but not uncommon either. If it contains an ISO 9660 filesystem it should be mountable by mount -t iso9660 -o sbsector=351017 /dev/sr1 /your/mount/directory It is just 1.5 MB large. So there cannot be much file content in it. > This is the output on the same drive from the mystery CD. > first: 1 last 20 > track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 0 mode: 0 > track: 2 lba: 17271 ( 69084) 03:52:21 adr: 1 control: 0 mode: 0 > all the way up to > track: 19 lba: 280452 ( 1121808) 62:21:27 adr: 1 control: 0 mode: 0 > track: 20 lba: 293350 ( 1173400) 65:13:25 adr: 1 control: 0 mode: 0 These are all non-data tracks. Probably audio. They are not mountable as filesystems. Google finds me for "Linux play audio CD" this Mplayer page: https://www.cyberciti.biz/faq/linux-unix-mplayer-playing-audio-dvd-cd-using-bash-shell/ Its advise is to do with not mounted /dev/sr1 : mplayer -cdrom-device /dev/sr1 cdda:// -cache 5000 > all the way up to It would be interesting to see whether there are other track types. I see that wodim does not display session end marks, as cdrskin does. With cdrskin there is an option with better readable output cdrskin -v dev=/dev/sr1 -minfo (Not to be confused with option -msinfo.) It will display session numbers and track numbers like: Track Sess Type Start Addr End Addr Size ============================================== 1 1 Audio 0 23259 23260 2 1 Audio 23260 45066 21807 3 1 Audio 45067 61931 16865 4 1 Audio 61932 81696 19765 5 1 Audio 81697 101666 19970 6 1 Audio 101667 125461 23795 7 1 Audio 125462 143956 18495 8 1 Audio 143957 164231 20275 9 1 Audio 164232 185991 21760 10 1 Audio 185992 202361 16370 or Track Sess Type Start Addr End Addr Size ============================================== 1 1 Data 0 64211 64212 2 2 Data 75614 95346 19733 3 3 Data 102249 121981 19733 4 4 Data 128884 132113 3230 Please post full lists without "all the way up". > sr 1:0:1:0: [sr1] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE > sr 1:0:1:0: [sr1] Sense Key : Illegal Request [current] Info fld=0x506a2 > sr 1:0:1:0: [sr1] <<vendor>> ASC=0xc6 ASCQ=0x2ASC=0xc6 ASCQ=0x2 > sr 1:0:1:0: [sr1] CDB: Read(10): 28 00 00 05 06 a2 00 00 02 00 end_request: > I/O error, dev sr1, sector 1317512 > Buffer I/O error on device sr1, logical block 164689 The failed SCSI command tried to read two blocks starting at block 0x506a2 = 329378. The error message formatters multiply this number by 4 to get 1317512, and divide it by 2 to get 164689. (We laugh, so we don't have to cry.) The error code indicates that the drive refused to perform this command. Righteously, because the address 329378 is far behind the last track end at block 306750. It is not clear to me which part of Linux or systemd came to the idea of reading that block. It was futile and not very smart. Unless there is a data track among the skipped ones in your track list, none of the blocks of the mystery CD would be readable by SCSI command READ(10). Only commands READ CD or READ CD MSF will do. > It looks like it probably can read normally if one skips some of the > control sectors. The words "control" and "mode" stem from SCSI specs. They apply to the whole track. MMC-5, table 17 says: "CONTROL The Control Field has 4 bits that define the type of information in the frame: 00x0b = 2 audio channels without pre-emphasis 00x1b = 2 audio channels with pre-emphasis of 50/15 μs 10x0b = 4 audio channels without pre-emphasis 10x1b = 4 audio channels with pre-emphasis of 50/15 μs 01x0b = Data track, recorded uninterrupted 01x1b = Data track, recorded increment 11xxb = reserved xx0xb = digital copy prohibited xx1xb = digital copy permitted The bits of the control field (except for the copy bit) may change during a pause (X=00) of at least 2 seconds and during the Lead-in area only." You showed tracks with these control values: 0 = 0000b = 2 audio channels without pre-emphasis and without copy permission (which nobody cares about) 4 = 0100b = Data track, recorded uninterrupted, no copy permission Have a nice day :) Thomas
