it's a MacBookPro 4,1 (i think it's the one prior to the unibody ones),
no apple care or warranty...
and under DVD-Write it says: -R, -R DL, -RW, +R, +R DL, +RW
so it *should* write just about anything, and i have in the past burned both single and dual layer DVDs...
this is a recent thingy... 😡😕