On Wed, Oct 21, 2020 at 9:22 PM Mike Stein <mhs.stein_at_gmail.com> wrote: > > FWIW the 8x50 manual specifies DD diskettes, no mention of any so-called QD diskettes.Obviously BPI and density per track would be the same, only the track width and spacing would be different; the higher capacities were achieved by varying the BPI according to the track number. > as I wrote already, when drive manufacturers started to make the 96tpi and 100tpi drives, all media available was the "DD" one, so those drives were designed to work with the available media of course. Later probably some disk manufactures started to sell "certified" media for 96tpi, that was exactly the same old "48tpi" certified media. However, again, the drives were designed to work with the available media of the time. The higher track density is obtained with better and smaller heads and much better head positioning. > Lots of misinformation out there on this topic, especially when you bring High Density diskettes into the conversation. Agreed. I think the URL I've previously posted has most of the available informations about this topic. FrankReceived on 2020-10-21 22:01:57
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