One can prevent freezer burn by making sure to freeze food with no air (as much as possible) inside the wrapper -- for example, by using a ziplock bag or clingwrap (but first push out any air before sealing), or use vacuum sealers.
If you leave air inside the food wrapper, the liquid in the food will 'evaporate' and transfer to the sides of the wrapper or container and take the form of 'frost' on the inside of your food container. And you will end up with the dreaded freezer burn on the surface of your food. Reheating the whole lot will not reverse the damage to meat.
While eating freezer-burned food is safe (albeit bad-tasting), it might be better to prevent freezer burn altogether