The Problem was:
I could not read a whole CD image on my Toshiba SCSI DVD-ROM (SD-M1201)
with dd accessing /dev/scd0.
It worked perfectly on my Phillips SCSI CD-Writer.
1. It does not work.
There is a bug in the Linux SCSI CD device driver (sr.c). The driver
tries to read some blocks ahead, but when it fails at the end of the
disk, it receives an error and stops.
The CD-Writer returns a correct VOLUME_OVERFLOW sense key and the
driver will correctly read the last blocks. At my DVD CD-ROM, the
driver receives a 0x70 sense-key (instead of the correct 0xf0) and
fails.
There is definitly data missing! The problem is not a try to read
beyond the end of the data blocks. It is a problem of the read-ahead
mechanism.
2. It works, if you are using the (new) sg-device driver and the sg-tools
(here: sg_dd2048 accessing /dev/sg1).
I think it works, because the driver does not try to read ahead.
3. Nobody can (or tried to?) confirm the problem.
Regards
Sven
--
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