DTS-HD Master Audio - Another lossless audio codec similar to Dolby TrueHD. The difference between the two is that DTS-HD MA is built in a core+extension configuration (just like DTS-HD HR). DTS-HD MA track takes up more disc space than a TrueHD track, it does not require a secondary standard track for backwards compatibility. Since both DTS-HD MA and TrueHD are lossless, they are both 100% identical in quality to the studio master, and hence identical in quality to each other. Like DTS-HD HR, Master Audio is optional on the Blu-ray format. If the player does not support DTS-HD MA, it can extract the standard DTS core.