Thanks will buy one of those when if figured out size fits into this machine.As @samplenhold and other have stated, it's best to use a sureillance-rated HDD (not SSD) for video clips, as it's purpose-built for constant 24/7 writes. Major players are WD Purple and Seagate Skyhawk.
I would not put too much emphasis on "cheap" when it comes to my PC for running BI and recording video clips.