Please consider purchasing a surveillance grade hard drive designed for use in a security camera system to go along with your new recorder. Remember that 4 and 8 camera recorders can have 1 hard drive fitted, 16 camera can have 2. When you purchase the hard drive at the same time as the recorder we include installation, formatting and testing free of charge. This is to ensure your system is fully functional and plug-and-play ready when you receive it.