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How to unlock a microsd that was in an Android?

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alank2:
I have a 16G microsd that you can see the contents of and it looks like android OS file stuff, but I can't erase or format it.  I've tried removing the read only attribute with diskpart and other things with no luck.  I read that CMD27 can set or clear bits related to write protection, but I don't see any info about this.  Has anyone else run into this and know of a tool that resets the card so it can be written to again?  I've got a project going with fatfs on AVR so I can sent commands to it if I just knew the right one to send.

amyk:
Get the SD specification and read through it. There's various levels of protection that they have, hopefully the "permanent write protection" is not set.

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