New Rom not reading 64gb sd card

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http://forum.xda-developers.com – i flashed both synergy build 77 and galaxy mod rls1 yesterday, and neither of them will read my 64gb sd card. It always tells me that the card is safe to remove. i know it is not the card because i flashed cleanrom 3.0 and other roms and it worked fine with them. I also tried redownloading and reflashing twice to see if it was maybe a bad download or flash, but i got the same results. Any ideas as to why these two specific roms aren't reading it? (HowTos)