well no it does not need to be connected to a scsi card, you will just need scsi-emulation...
anyways in the terminal type:
and you will get your device number in the first column in the output...
for instance mine says:
0,0,0 0) 'AOPEN ' 'CD-RW CRW2040 ' '1.22' Removable CD-ROM
so by that i see it is 0,0,0
after you find out that info you can then burn from command line
an example of a command i would use is:
cdrecord --dev=0,0,0 -speed 20 -eject nameofFile
so to break it down you will specify your device with --dev=
then you can specify the speed at which you want to burn at, and then -eject will eject the cd after burn completes, and then lastly you give the name of the file...
will give you a big list of available commands..