There are several requirements of hard disk drive (HDD).
1. The disk should be professional security HDD, not the PC-base.
2. The type should be SATA. SATA2(3GB/s) or SATA3（6GB/s）is recommended.
3. We recommend 5400 RPM.
4. The capacity should be less than or equal to the recorder's maximum capacity.
Here are some models we have tested before.
Note: Before installing the hard drive disk, please power off the system if it is on.
Step 1: Loose the five screws which are fixing the box cover.
Step 2: Push forward the cover to the end and remove it.
Step 3: Connect the hard drive to the DVR System
Step 4: Turn on the DVR and check whether it detects the hard drive."MAIN MENU"-"INFO" HDD INFO".
Step 5: Power off the system. Fix the hard drive inside the box. Put screws on to fix the hard drive inside the box.
Step 6: Put the cover back to position and install the screws to fix it.