On 7/7/17 11:10 AM, Chuck Guzis via cctalk wrote:

> I've puzzled over how to do tape flux-transition recording in any
> meaningful way.

The way JBI did it was to digitize the capstan encoder as a clock reference for 
tape motion
obliquely referenced in
http://storageconference.us/2008/presentations/3.Wednesday/5.Bordynuik.pdf

--

Thanks to the current administration, all of the NASA Nimbus data reports 
appear to have
dissapeared from the web.

mentions in
http://www.sciencedirect.com/science/article/pii/S2214242815000212#bb0035

"An examination of these 7-track tapes revealed they were in poor shape. The 
tapes iron oxide media was falling off the
acetate film backing. Fortunately, GSFC had just learned of a Canadian company, 
JBI Incorporated that had developed a
tape recovery process that could read the bits from magnetic tapes with a high 
degree of certainty. The JBI recovery
process involved using specially developed tape drives with 36 magnetoresistive 
(MR) heads, tape baking (10 h at 175°),
bit detection and processing techniques to read the 800 bit-per-inch, 7-track 
tapes. Based on the original Nimbus HRIR
system documentation, GSFC was then able to recover and rescue the observations 
from thousands of Nimbus HRIR digital
data tapes"

M. Hobish, D. Gallaher, G. Campbell, W. Meier
Dark data rescue: shedding new light on old photons
The Earth Observer May–June 2014, 26 (3) (2014), pp. 4-10


for example

gsfc.nasa.gov/nimbus/documentation/documents/N7_Recovery_Report_Jul16.doc

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