Re: wodim "Cannot open SCSI driver!"
Hi,
> I have suspected a hardware error as well. Is there
> any way to confirm this?
You could try whether it can recognize any kind of other medium:
wodim -v dev=/dev/sr0 -toc
If i run this on an empty drive, i get
...
Current: 0x0000 (Reserved/Unknown)
...
Sense Code: 0x3A Qual 0x01 (medium not present - tray closed) Fru 0x0
...
wodim: No disk / Wrong disk!
That's what i expect with your drive and problematic media.
With a non-blank CD-RW i get
...
Current: 0x000A (CD-RW)
...
Manufacturer: CMC Magnetics Corporation
...
track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 0 mode: -1
track:lout lba: 23260 ( 93040) 05:12:10 adr: 1 control: 0 mode: -1
With a blank CD-R:
...
Current: 0x0009 (CD-R)
...
Sense Code: 0x24 Qual 0x00 (invalid field in cdb) Fru 0x0
...
wodim: Cannot read TOC header
wodim: Cannot read TOC/PMA
(These complaints are normal. wodim should not try to inspect
the CD-R content after the burner reported that it is blank.)
With blank DVD-R:
...
Current: 0x0011 (DVD-R sequential recording)
...
... same complaints as with blank CD-R ...
> Strange thing tho I recently burned an ISO DVD movie
> to a DVD with no problem.
The laser beams for CD and DVD are of different wavelength.
It seems that there are two different laser diodes used.
http://mods-n-hacks.wonderhowto.com/how-to/extract-laser-diodes-from-dvd-burner-computer-drive-398495/
> I'm used to things in the
> computer world either working or not. But perhaps the
> burner is one thing where the result can be spotty as
> well as perfect or not at all.
The process of imprinting information relies in part on chemistry.
This opens the door for thermodynamics and its weirdnesses.
(How does a Crooke Radiometer work ? What's really behind the
Mpemba effect ? Public explanations are ridiculous despite the
experimental situation being quite clear.)
Nevertheless, if the CD laser diode is dead and the the DVD diode
still works, then this is a case of works-not-at-all-with-CD.
Have a nice day :)
Thomas
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