for usb wirte-protection 


 you can access the files, you may be facing a lack of permission to do more than that. You can check the permission level and change it to see if that give you full access to the drive.

•Go to Computer
•Right click your thumb drive
•Click on Properties
•Click the Security tab
•Select Everyone and click the Edit button in the dialoge box
•In the Allow column, check the Full Control box
•Click Apply and OK
This should ensure that Access Control is ruled out as the souce of the Write Protected situation.

OR -

Use DiskPart Open a command prompt window for the windows version you are using

•In the command prompt type diskpart 
•Type list volume to identify the thumb drives volume #.
•Type select volume # where # is your thumb drives # and press enter.
•Type attributes disk clear readonly press enter. You should get text back saying Disk attributes cleared successfully
Remove the thumb drive, then reinsert into USB. 

Check the drive in question, you should now be able to access the disk with full permissions.


http://superuser.com/questions/483719/how-can-i-disable-write-protection-in-my-usb-flash-drive