Ratmeat

I put this system in for my parents several years ago and it has run flawlessly as a video camera recorder for a security system. Now the hard drive needs to be replaced. I am looking for an owners manual for this device or for someone to let me know how to format this drive for use in this device. The owners manual has long since been lost and I have just plain forgotten how. Any assistance would be greatly appreciated! Thanks in advance all! Gary