Zip drives are not. I don’t recall what the mineral was but it was a rare Earth. In the transitional side of them. (A mineral with metal like properties).
I remember reading tape heads were once based on a cobalt system. Bot over time of use they would become permanently charged magnets and ruin tape cartridges. For the life of me I can’t recall the format but just before VHS and Beta there was a home tape format that used cobalt heads. That in practice quickly started blanking tapes.
Rhodium is Paramagnetic and as such makes a good source for very small week magnetic transfers.
There are a few rare Earth (and related) minerals that under charge become Paramagnetic, used in older systems (like Zip and Floppy based systems) that don’t require the same scale precision.
But we’re way beyond my study here. Para fero, dia, con, lol. Oh my.
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