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While cleaning a storage room, our staff found this tape containing #UNIX v4 from Bell Labs, circa 1973
Apparently no other complete copies are known to exist: https://gunkies.org/wiki/UNIX_Fourth_Edition
We have arranged to deliver it to the Computer History Museum
#retrocomputing
3200 fci is flux changes per inch, so basically the number of bits per inch of tape.
700GP is the style of tape. 1/2 inch, 9-tracks.
The length of the tape depends on the size/diameter of the reel it’s on. Going by the markings on the left it’s about 1000ft of tape.
Using those measurements, that’s about 38.4MB of storage on that tape
Well done