How can I remove the writting protection from my USB SAHARA eDRIVE 4GB?

Since that phenomenom occured, I can neither copy nor delete information from my USB Pen Drive. Please, tell me what to do and how to do it to get once again my USB Pen Drive usable.
File System changed in NTFS.
Material name: Hitachi HTS543216L9A300.
Pilot version: 5.1.2535.0
Pilot date: 2001/07/01.
Sam777, August 2011


done
Follow this tips in this article
http://www.flashdrive-repair.com/2013/11/8-ways-to-fix-write-protected-usb-flash-drive-and-memory-card.html

Flash Drive Repair Software, December 2013
link Click here to see other fixes for Hitachi.