How to use cdrecord?

[Ong Ying Ying]

I used :
cdrecord -v -data -multi dev=0,0,0 /mnt/cdimage.raw
hoping to be able to append to the CDRW.

It seemed to burn to the cd fine the 2nd time (using the same command) 
but I cannot see what I burned the 2nd time. The track number increases 
on its own but I cannot get to the second track. The data that I burned 
the 1st time was still there and ok but the 2nd burned data cannot be 
found. What went wrong?

What is lun?

Where can I find mkbootdisk program? I have one mkbootdisk shell script 
but my bash showed 'command not found'. Why?