9-tracks now?
They got new ones?......................
The old mainframe reel to reel were 8 tracks with a 9th CRC check bit track. But I suspect that you knew this ... ;)
My first mainframe (IBM 360) had an enormous 256k magnetic storage unit - filed an entire cabinet IIRC.
The entire system was moved from Wichita Falls to an Odessa TX bank in the early 80’s as an emergency backup.
Don’t think that it was ever turned on - couldn’t afford the electricity bill for the testing.