Support Phone keeps write-protecting microSD card

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http://androidforums.com – Yesterday, I rebooted my phone. That is, turned off the phone and held the power + T keys. I have a 16 GB SanDisk MicroSDHC that was working perfectly up until then. Then, when I put it into my computer to add files and such, it locked up and said something like "Please insert disk into drive H:". I tried formatting it with Windows and a program from SDcard.org, but no luck because apparently, the card is write-protected. I've checked the switch a million times, and the problem is not the reader itself; it worked fine with another card of the same brand. I was successful in form (General)