How to unlock write protected micro sd card

Whats gonna happen when you try formating again?? Is there no some option to enable it ??

I tried to format the memory card through DOS prompt and directly. In DOS prompt I'm getting the message "bad sector - unreadable memory". When formatting directly the message I'm getting is "the disk is write protected, disable the write protection switch and try again", and the card reader gets disconnected whenever I try to format the memory card in it. The data in the card is readable, but I can neither copy or delete it nor write into it.

Hi friends i also face this problem when try to format with computer it shown "the disk is write protected, disable the write protection switch and try again" can any one help me out of this problem i have 4GB memory card..please reply