The purpose of the password is to protect the "changes" done for the system under the RAID MASTER or LCM for the RAID Mode setup, not for the data itself. User can choose to or not to set up a password based on preference. The password is limited to 8 digits maximum. It is highly recommended to use numbers only because the same password would need to be inserted in the LCM if the RAID MASTER software is not available and each alphabet letter is represented by its placement in the alphabet (i.e. 1 for "A", 11 for "K", 26 for "Z"), chosen by clicking the button that many times.