Back when? I upgraded my storage with a couple of 14TB drives ~2 years ago and HDD was the only answer. Doing a quick search, the largest SSD I can find at the moment is 8TB and they're well over $1,000 each.

Also, there are crazy strong magnets inside of HDDs. I initially thought this is what the above was referring to since I use the magnets from old decommissioned HDDs to hold things to the fridge : D

EDIT: I am weird though and prefer a desktop as my primary computing device... which doubles as a media server... in addition to my non-media server.