Hm... well, theoritically burnt at any speed also can, better if u have an old CD-RW that has only a max speed of 8x(i have one specifically for burning CDs, an old Ricoh), but for most modern 48x-52x CD-RW drives, i actually really find that 12x speed is the error free speed, not too sure why as i'm not a CD-RW driver engineer(no science to prove it), but well, i was just recommended it since i've "great" success using that speed. Glad that Bryan find it the same :D