I'm trying to find a 3rd party external DVD writer for my iMac (late 2012). What bothers me is that most of them use the dual/y-shaped USB cable instead of straight forward USB cable like Apple's Superdrive. One that I like and use a single straight forward USB cable is not available in my first world country. From what I understand the extra USB plug is for drawing more power to the drive, and it's not required to be plugged in at all time. My question is, since Apple's Superdrive can do all its work with a single USB cable, does this mean those other drives can also do all its work without attaching the extra USB plug to my iMac? I heard somewhere that the newer computers can provide enough power with a single USB port. Is that true or it depends on the DVD drive? I despise the Y-shaped USB cable and I wish to avoid using it (if I can't avoid buying it).