I have an hp8200 Ultra Slim PC I want to use for 24/7 video surveillance. It only supports one 2.5" internal drive. I need drive that can run the OS 24/7 and work ok for video monitoring. I have 4 720p IP cameras set to only record on motion. My thought was either a WD red NAS drive (good for 24/7, but not optimized for video) or maybe an SSD. I thought of an internal NAS for the OS and an external video drive but cost is a concern too. Any thoughts would be appreciated.