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Re: [midatlanticretro] Re: Had to share this...

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  • schwepes@moog.netaxs.com
    I remember searching the country for a supply of working seven track players for anti submarine work in the early eighties. the problem was that the old data
    Message 1 of 8 , May 12, 2008
      I remember searching the country for a supply of working seven track
      players for anti submarine work in the early eighties. the problem
      was that the old data was on those 7trk tapes and we needed a means
      of both maintaining old equipment and transfering the information to
      newer media.
      bs


      On Mon, 12 May 2008, Herb Johnson wrote:

      > > There's another interesting computer/space related story that
      > > started several years ago. [Researchers] want to recover all
      > > the data from the mountain of 9trk tapes to analyze the telemetry
      > > data for signs to the mystery regarding the [Pioneer's] decrease
      > > in velocity while trying to exit the solar system--they're having
      > > a lot of success with this too--
      > > =Dan
      >
      > There's a similar story about recovering data from tapes of the Mars
      > Viking Orbiters. Those were SEVEN track tapes and not well stored. The
      > recovery of data is comparable to the recovery of data from the
      > Shuttle diaster. The tapes were so old that the data could only be
      > read ONCE, because rewinding the tapes would cause the magnetic
      > domains to scramble. Briefly, the problem was that the magnetic
      > domains on one tape layer were in tension from layers above and below
      > for periods of decades. When rewound the tension shifted and
      > "released" the domains, reducing the signal on a subsequent read.
      >
      > The problem of data recovery from Pioneer, like Viking, was that there
      > was funding to collect the data, but none to PROCESS it. At least they
      > saved the tapes, probably in a basement somewhere like Viking's.
      >
      > herb johnson
      > retrotechnology.com
      >
      >
      >
      >
      > ------------------------------------
      >
      > Yahoo! Groups Links
      >
      >
      >
      >
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