I am not sure I understand the question. The root user should have write permission to any file on the system by default. If you are trying to get read/write access to an NTFS (Windows) partition, you need the ntfs-3g package. If you want to make all files on your system world read/write-able, I strongly recommend you do not do so. Such an action would constitute a serious breach of system security. If an intruder should gain access to your system, there would be nothing to stop him/her once inside. Good system security is a multi-layered effort which should consist of a firewall, an intrusion detection system, encryption for critical files (financial records, etc.), and good file permission configuration. I also use a root-kit scanner (rkhunter) which I run in a cron job daily (just in case ...). I never log in to my system as root. When I need to perform operations which require root access, I do so from my regular user session. MCC and the Software Installer request my root password to run as a root process, and I have an icon set up to run the Konqueror file manager with root access as well. If my task can not be accomplished using the above tools, I open a terminal window and su to root to complete it. The idea is to keep the root account activity to a minimum. To learn how to change file permissions, open a terminal window and run the following command:
The chmod manual page contains all the information you should need.
HTH,