How to remove media write protection in external hard drive

A utility called "Thumbscrew" may fix the write protection: http://www.irongeek.com/i.php?page=security/thumbscrew-...

You could remove the write protection like this:
http://www.itrelated.info/remove-write-protection-from-...

hello Sir, I already tried this process.. but sadly I dont have a folder called "Storage Device Policies".

Its weird because I've been using my external HD for a long time, and then suddenly it becomes unreadable.

Any other options I can do? I have super important files related to work thats why I need to recover my files  

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I tried it but it still says "The Media is write-protect"  

There are some software to fix this write protected drive problem online. You could select one to take a chance.