Difference in lens of DVD combo drives and normal CD-R/RW drives



Hi all,

I am looking to buying a new CD burner since I have given off the old Lite-On to my bro. I wanted to know if there is a difference in the lens of a CD-R/RW drive and a CD-R/RW-DVD combo drive, other than it can read DVD’s. Also, do the combo drives take a performance hit than normal CD-R/RW drives. Which drive would be the best buy, keeping copy-protected CD’s in view and also in terms of performance?