You realize that $100 50 pack of writable Blu-Rays is only ~1.25TB, plus you need the burner at $80. Even at current prices, a 1-1.5TB HDD is only $120-170. Fry's is still often putting 2TB on sale for ~$180, sometimes even 3TB for around that price. The HDD will be much faster, has relatively high speed random access, and won't require you to swap in one of 50 discs to access your data. I think the HDD still wins.