Is while these are marketed as backup. Backup is not "storage" but a copy that if lost means we didn't lose anything because it was a backup copy. Too many have lost files because there was no backup copy.
So it appears you are looking for storage. And might worry that when the storage fails, what next?
You asked "can I effectively use an external hard-drive as my main hard drive?" YES, but ONLY IF there is a backup when it fails. And there is no known system today that does not fail. Hope that helps.
At least you noticed.
I am making a laptop switch from PC to Mac (MacBook). In the past my PC would always get bogged down because of too much music, pictures, and movies and I vowed that this would not happen on my new Mac. In addition, I plan on getting the iPad too when the price drops. What I would like to do is have a central, wireless, "server-like" drive that both the MacBook and the iPad could draw from.
My first thought was the TimeCapsule, but the 2 TB model is pretty expensive, and I don't like the idea that if the router or hard-drive fails then I am out of both.
My idea now is to get an airport extreme and hook up an external hard-drive. My quesion is this: can I effectively use an external hard-drive as my main hard drive? It seems that all of these external hard-drives are marketed as "back-up." What external hard-drive should I look at?
Thanks for any help on this issue.