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In some cases this would be a sort of DRM, sure. But it certainly wasn't universal. Most smaller-midsize distribution houses just used something like this:

https://www.awp1.com/st.html

Or, if they were very small, they would just use multiple smaller scale devices that could do 2-4 copies at a time, like this:

https://pbs.twimg.com/media/Dgr_J-NUEAAHZ0I?format=jpg&name=...

Some of the expensive ones of these could do magnetic signal copying, but most just did sector-by-sector.

At least, that's my understanding. Bit before my time.




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