Hey there, Edbobdob!
Indeed, the
WD Purple should deliver on your intended purpose because it is built for 24/7 always-on, high-definition security systems. You can check more of its specs on our website.
However, regardless of the OS you will be using, I'd recommend you to have a different booting drive for that PC build.
Providing us with more details about the PC configuration and the security system setup that you intend to build would really helpful, if you need further assistance.
Best of luck!

SuperSoph_WD