Comment Re:Why not just use hard drives and then store... (Score 2) 193
They'd also be cheaper, even at the bulk HDD rate that FB would pay.
A quick on-line search show a spindle of fifty 50GB Blu-Ray discs (2.5 TB) retails for about $100. A 4TB HDD costs about $140. So HDD is actually cheaper per byte of storage. Maybe wholesale price ratios are way different from retail, but I see no reason to assume that. So BluRay doesn't win on price, volume, or access speed. The concerns about moisture and big temperature swings seems odd. Are Facebook data centers exposed to the weather?
Seldom used data sitting in spinning power draining disks has a continuous power cost.
Power and cooling are important data center considerations.
Facebook has an astounding pile of data in picture archives that after a couple months are
only called on once in a while if ever again.
Layers of storage from the modern very quick SSD devices to spinning rust disks to perhaps BluRay
seem to have a place when access time and space considerations come to play. I wish them luck.
One problem with BlueRay, DVD and CDROM media is the lack of data as storage beyond
five years or so. But as a physical form factor goes these little devices do have a lot of potential.
I wish them luck and wish I knew what vendor to invest in.