Thanks for the reply...
I've had them about a year. They have worked fine. I just want to add some more cameras and start recording full time.
I have an Inspiron 3847 64-bit 8GB RAM with Intel Core i5...
I have two Foscam FI9831P cameras, Blue Iris software and I want to add a recorder and two more cameras. Any suggestions? Should I just get a WD Purple drive and use this computer?