SD Card won't read on Epic 4G

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http://forum.xda-developers.com – I turned my phone off and on and now my SD card isn't being read. My phone says it's mounted and I can go into it with Root Explorer and mess with anything and everything, but when I go into Apollo or Google Play Music, no music is shown, and when I go into gallery, no pictures are shown. How do I fix this? (HowTos)