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So, right now Rockbox won't boot because of missing firmware files. You said, "Its also not recognizing about half of my music." If "it" refers to the SanDisk firmware then I'm not sure what I'm supposed to make of this. If MSC mode doesn't work then it sounds like something went wrong with the SanDisk firmware. You could try doing the recovery procedure (which you can find from the SansaFAQ page).
it just shows two blank generic removable drives instead.
Its also not recognizing about half of my music
After I put show hidden folders, it didn't do anything.
When you right click on the card and go to properties, it says its 0 bytes.
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