I have a maxell pendrive, and if I use it on Ubuntu, Icannot write on it. Its not a permission problem, I tried sudo nautilus, but it diidn't help still said it's read-only. The problem is that it's have two partitions, a secure, and the storage. I don't use any password, but the secure partition contains an exe, where you can set up a password. I think there is the problem. Reading is fine. On windows no such problems. Thanks for the help.