[Debburn-devel] Error message for command "readom -fulltoc dev=/dev/dvd"

[Thomas Schmitt]

Hi,

> I guess it is a typo and you meant:
> 43 00 02 as given in the log, or you really mean 42 00 02?

43 was meant. (There is no 42 in my list of SCSI commands.)


> the readom source surely indicates that DVD is also meant to be read:
> but it can be buggy as well?

Nobody ever raised protest here, when i repeatedly stated in the past
that the DVD and BD capabilities of cdrkit are not state-of-the art.
I would advise dvd+rw-tools, e.g.:

  dvd+rw-mediainfo /dev/cdrw

or my own programs

  cdrskin -v dev=/dev/cdrw -minfo

  xorriso -outdev /dev/cdrw -toc


readom will not be able to produce the Table-Of-Contents as of CD
by reading a DVD or BD:

 Read  speed:  7056 kB/s (CD  40x, DVD  5x).
 Write speed:  1764 kB/s (CD  10x, DVD  1x).
 TOC len: 81. First Session: 1 Last Session: 1.
 resid: 1
 01 14 00 A0 00 00 00 00 01 00 00 
 01 14 00 A1 00 00 00 00 01 00 00 
 01 14 00 A2 00 00 00 00 03 19 25 
 01 14 00 01 00 00 00 00 00 02 00 
 01 54 00 B0 05 37 25 03 4F 3B 4A 
 01 54 00 C0 66 00 9C 00 61 1A 41 
 01 54 00 C1 48 34 78 00 00 00 00 
 Lead out 1: 15262

MMC describes the meaning of these 7 entries as "TOC Track Descriptors". 
libburn uses them to get info about tracks on CD.
Useful for learning about Table-of-Content are:
 01 14 00 A0 00 00 00 00 01 00 00 -> first track number is 1
 01 14 00 A1 00 00 00 00 01 00 00 -> last track number is 1
 01 14 00 A2 00 00 00 00 03 19 25 -> disc ends at 3 min 25 sec 37 frames
 01 14 00 01 00 00 00 00 00 02 00 -> track 1 starts at 0 min 2 sec 0 frames
 
The other three records are about exotic stuff which i only understand
in part.

The specs clearly state that no DVD or BD will return such raw data.
readom would have to fake them from other info.


Have a nice day :)

Thomas