I think RED raw footage has 14TB per hour. But of course it makes more sense to do offline in ProRes. Render farm should probably be used to do online renders. But still, at current SSD prices I can't imagine having internal SSD for all the data. Maybe graphic designer could fit few projects onto 512GB-1TB SSD but video editors hardly.
I love this quote so much...
From /sys/i386/include/vmparam.h (BSD 4.4)
/*
* Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
* so we loan each swapped in process memory worth 100$, or just admit
* that we dont consider it worthwhile and swap it out to disk which costs
* $30/mb or about $0.75.
* { wfj 6/16/89: Retail AT memory expansion $800/megabyte, loan of $17
* on disk costing $7/mb or $0.18 (in memory still 100:1 in cost!) }
*/
Prices are coming down. And hard disks are useless anyway (unless you spend hefty sums) to provide the kind of bandwidth you will need.