Interesting. The video system that I use is a cheap one (and doesn't require internet access, but optionally supports it -- I don't even have it on a network of any sort at all).

Replacing the hard drive in it couldn't be easier. You do have to remove four screws to get into the box, but once there, you just unplug the old one and plug in the new one. When you power it up, the box notices that the hard drive is new and asks you if you want it to be prepared for use (with requisite warnings about losing any data that may be on it). If you click "Yes," it does what it needs to do and starts using it.

Aside from opening the case, my grandmother could handle this without any problem at all.

I simply assumed that better systems than mine would be as easy, but perhaps I assumed too much.