Just some advice for any ppl using MK3, if u upgrade to a later OS there will be no benefits after version 22.1. So its not worth upgrading because the MK3 computer is not capable of showing them. Also if you really do want to upgrade to say V29.1 when u use a MK3 u need to use Imgburn and burn at 4x or less. Some ppl might already now this but just wanted to make those MK3 users aware because a lot of advice on this topic assumes u have MK4.