Dang, I know someone with 400TB's of storage in their basement. Kinda crazy when you think about the fact that those super exaggerated figures from classic sci-fi are attainable with some effort nowadays.
400 TB is within everyone's grasp nowadays. My HDD is 6 TB and costed me $80. Granted is 5400 rpm, hence the low price but buy 67 of them and it costs only $5360. I mean I pay more rent in 12 months.
I just borrowed that book for an hour to read it. Fun note: the three quadrillion bits of information mentioned works out to be around 400 terabytes.