so i use Roxio's "Toast" software with the latest Blu Ray plug in installed, using my new LG Blu Ray writer, and my new 25gb Verbatim Blu Ray discs. every time i try to put the mkv file into toast, it says the mkv is unsupported. i tried this with 720p, & 1080p. i am very new to burning blu ray, but not a stranger at all to burning dvds. im sure there is a difference in burning the 2, but can someone please help me by explaining what i might be doing wrong, or what i need to do. i haven't tried a .m2ts yet. i am using a trial period of MakeMKV at the moment, i am ripping a blu ray i own to see if it works on ripping, then i will try on an existing mkv file i have. if anyone can help me in getting mkv or m2ts files burned to blu ray discs that would be great, and much appreciated!! i managed to burn a few episodes of Planet Earth in 1080p (1-6) on 1 25gb blu ray disc as data, but cannot get them to play in my blu ray player or ps3.this is the main reason i want to burn them. i am wanting to back up movies so i can watch them on my blu ray player. i have searched high & low for a solid ripper/convertor/ or anything, but it seems like everyone has a different opinion on whats best. i am all ears to everyones opinions. i would really like to figure this out "how to burn anything to blu ray to watch on my player". thank you guys!!!!!!