Files are permanently read only.
What operating system are you using? If your using a Microsoft Windows operating system, you can go to Start->My Computer , open my computer, and right click on the drive in My Computer, and change the access of the drive there.
If your using a NIX(Linux, Unix, OSX) operating sytem, you need to mount the drive with rwx permissions, and to do that you'll have to edit the fstab file in /etc.
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