Simple answer is you can't. You can put in the write-protect notch or remove the write-protect toggle tab but it can be restored and write-protection is optional in a reader.
Dear, there'sn't any key for lock to write protection or to unlock in microSDs but yes in reader, but i've a miroSD which is write protected and reader lock isn't inspecting on it. Even it is unformatble in all types of cell phones, n flashers, when ever i try to delete some data or try to format that card it say: "Access Denied.
reason:The derive is write protected".
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