[Bug 1896804] Re: CD/DVD drive detected as read only, command line and GUI programs

[Thomas Schmitt]

Hi,

sorry for your drive.

But good for Linux burn programs that MS-Windows does not know something
essential about drive error messages which we Linuxers don't know.

> the srange this is that if you use the Disks program in utilities.

That's probably a message from the kernel via systemd and lsblk.
Although the Linux kernel is willing to apply disk write commands to
overwritable media in optical drives, it mostly treats them as CD-ROM.

That's why there are burn programs in userspace which send SCSI commands
directly to the drive, circumventing the buffered block device layers of
the kernel.

And that's why much of the kernel's cdrom and sr driver code had few
motivation to follow the technical evolution from CD to DVD and BD.
(The relation of cdrom and sr is funny enough. cdrom was meant as
 abstraction of the various hunchbacked CD drives of the mid 1990s with
 proprietary controllers and command sets. sr represents for cdrom the 
 then rare SCSI drives which are now the only survivors at PATA, SATA 
 and USB. Meanwhile code execution hops forth and back between both
 drivers which are actually only one.)

Well, now i have to think what to do with my code change to tolerate all
6,28,XX error codes ...

Have a nice day :)

Thomas

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Title:
  CD/DVD drive detected as read only, command line and GUI programs

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