In pro terms the "DAT" is often called an RDAT,, R for rotary, referring to the azimuth head (the spinning head gives a HUGE tape-to-head speed without having to wind the tape at $STUPID inchs per second, exactly like a VCR, it writes stripe after stripe transversely across the tape....that's that the tracking's for in a VCR making sure the head is lining up with the prerecorded stripes.)
It's called RDAT to differentiate it from DASH (digital audio, stationary head), the name speaks for itself, but I have never seen a domestic machine using this, precious few pro/semipro ones come to mind....Tascam DA88 maybe, I seem to recall they used thin tapes (Video8, digital8,whatever it was called?) too thin for a spinny roundy thingy surely.
Dunno the specs for 8track carts (tho the cart player we had in the radio station weighed in somewhere between atrocious and "throw me out").
Open reel has no spec as such, it's a machine and tape speed thing entirely. Pro decks record stereo to at least 1/4inch, but up to TWO INCH, at anything from 7.5 to SIXTY inchs per second.
That's like wire recorder speed (Studer, who still make pro tape decks, developed wire recorders in Germany in the 30's for military use. when a tape fouls, you have to pick through it to sort it out, when a wire fouls, they pick through YOU to work out what's what.....hence they never really took off (except in flight data recorders, inside steel cases....fireproof media you see).
See what you get for encouraging me.