InPhase has packed 515Gb in a square inch of holographic media and plans 300GB drives and media later this year.
The first product will most likely be a 300GB disk with a transfer rate of 20MB/sec however the second wave of holographic media will range from 800GB to 1.6TB capacities.
1.6TB in a sing disc!?! That is awesome. It is safe to say that no one will ever-ever-ever fill up a 1.6TB disc. Buy one of those and you will be set for life.
(Note to my 3-5 year future self; be sure to point at laugh, when a single file size gets above the 2TB mark. Or when I delete 1TB off my home computer to "free up some space".)