turns out to be two solutions:
1. when I compiled cdrtools I saw a message at the end of the install - which slipped my attention the first time, probably because I was compiling a lot one after another as is common in Gentoo when you update the whole system...
the message said:
Note the special license on cdrecord/cdrecord.c starting from line 4648.
The command line option 'dev=/dev/hdX' (X is the name of your drive)
should be used for IDE CD writers. And make sure that the permissions
on this device are set properly and your user is in the correct groups.
And I read through the README.ATAPI
provided with the source of cdrtools and got the idea to change the command a bit.
If I do it like this - it works as I was expecting:
sam portage # cdrecord dev=ATA -scanbus
Cdrecord-Clone 2.01 (i686-pc-linux-gnu) Copyright (C) 1995-2004 J�rg Schilling
cdrecord: Warning: Running on Linux-2.6.15-gentoo
cdrecord: There are unsettled issues with Linux-2.5 and newer.
cdrecord: If you have unexpected problems, please try Linux-2.4 or Solaris.
scsibus: -2 target: -2 lun: -2
Warning: Using badly designed ATAPI via /dev/hd* interface.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.8'.
1,0,0 100) 'TEAC ' 'DV-W24ES ' 'S.0A' Removable CD-ROM
1,1,0 101) *
1,2,0 102) *
1,3,0 103) *
1,4,0 104) *
1,5,0 105) *
1,6,0 106) *
1,7,0 107) *
Now I have solved my question
and learned, that how I did it already was the normal and recommended way to do it.
One can give eighter dev=/dev/hdX or
the scsi-notation: dev=X,X,X after running the above command and inserting the numbers which correspond to the burner.
Thank you very much! You pointed me in the right direction.