So old Metallica albums are remastered (let ne guess, VERY LOUD?) and they come on SHM-CDs:
http://en.wikipedia.org/wiki/SHM-CD
SHM-CD (Super High Material CD) is a CD format that features enhanced audio quality through the use of a special polycarbonate plastic. (...) allowing for more accurate reading of CD data by the CD player laser head.
Amazing! Sounds like they could have simply printed those new CDs, without remastering, and they would sound better than ever!