Re: Issues with cdrsin and USB devices on RHEL5

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

> I'm going to cautiously say that this file, intended for humans but can be
> parsed, seems to handle anything up to a mix of IDE, "real" SCSI, and USB,

Yep. For me it yields plausible results with
4 drives at USB, IDE, and SATA.
  drive name:             sr1     hdc     hda     sr0


> and tells you what the kernel thinks of them. That may be more important
> than the truth, if a device says it can support feature X, but the kernel
> doesn't agree, I would not expect that feature to work reliably.

If the CDROM driver believes it then it does not
necessarily have to be true.
Example:
  Can read multisession:  1       1       1       1
is true with hda only for CD but not for DVD media.
This DVD-ROM drive is too stupid to recognize multiple
sessions on DVD-R or DVD+R. (One can scan for ISO 9660
headers, though, and successfully mount the sessions
via option sbsector= .) 

So the feature detection is a direct competitor
of libburn's own view of things. To take it into
respect would demand to establish conflict handling
in case of contradictions.

Nevertheless, i will consider to take the "drive name:"
line as a hint of how the drive list should look like.
In case of deviations, one could issue a warning.


> Thought it might be useful to tell you what the kernel
> would let you see and use.

A totally overhauled drive detection strategy will have
to collect info from such sources and try to verify
it by own drive inquiries.

So any hint about CD drive info sources is welcome.

For now i seem to have put a patch on the problems.
After the upcoming release i will reconsider that
topic and make some larger changes in the Linux adapter
of libburn.


Have a nice day :)

Thomas