> 
> I have burned cd's without issue while it was
> supermounted.
>

Of course if you start burn and go away for a while it works. 

 
> >
> > ... there where only seconds to finish writing a CD
> > ... I opened the
> > MidnightCommander to easy navigate the fs, taped the
> > /mnt directory (mc
> > reads ahead !?) ... and cdrecord stops writing the
> > cd with an I/O error.
> > Because the CDRW was 'supermounted'!
> >

This is basically the same issue on Winddows. If you try to access your
driver while burning you (with high probability) end up with unusable
disc.

> > Is it possible to switch off supermount for
> > CD-Writers by default? The
> > default user (if he/she belongs to the cdwriter
> > group) would enjoy it.
> >

It is not as easy. Nowadays often CD-RW is the single drive used both
for reading and writing.

It is good practice to leave system alone while burning your CD. 

-andrej

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