[Q] 64GB SD Card suddenly read only

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http://forum.xda-developers.com – Hi, i recently bought a 64GB Sandisk Ultra Microsdxc card for my Samsung Galaxy S III. When i used the Adapter to connect it to my Macbook, i couldn't read/write to its fat32, so i had to format it to something else, so i just chose ExFAT. I put some stuff on it, but now, two days later, the card is suddenly read only? It happend after i exceeded 32GB, although the picture says 36,38GB Available, that's because i tried to delete some stuff from the card. Does anyone have an idea why the card is suddenly read only? :) - Thank you! (HowTos)