On Fri, 10 Nov 2023 13:02:29 -0500, Tony Harminc wrote: >On Thu, 9 Nov 2023 at 17:48, Paul Gilmartin < >0000042bfe9c879d-dmarc-requ...@listserv.ua.edu> wrote: >> > >> I believe I saw one. A flat container of ferrite slurry with a >> transparent top >> and a diamagnetic membrane bottom. Pressed against the tape, it clearly >> showed record gaps. Reading the data would have been a challenge, >> even at lowest density. > >I have a can of that iron-filings-in-solvent from around 40 years ago. I >havent played with it for a few years, but the solvent hadn't evaporated, >and it still worked. > >It is indeed not feasible to read 1/2" mag tape even at 800 BPI, but what I >was able to read with just a magnifying glass is the magstripe on old >pre-chip credit cards. > What about low density?
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