The book of inspiration

May 12, 2013

Keep the movies fresh

Filed under: tech — zproxy @ 10:31 pm

… There was an exchange program in place to “keep the movies fresh”, so old film reels were returned to America, along with the disguised rolls, where they were then loaded onto GIANT magnetic tape recorders and played back. The bandwidth was up to 3 mhz per channel, up to 256 channels, which allowed one tape to store every signal of significance originating within a nation for the length of time the tape ran.

.. Total data storage on one of these tapes was equal to many petabytes.

… NSA does not like signals stored digitally, because they look for such small subtleties in the signal for source identification, and nyquist noise is a major hindrance.

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