Only in school, early 90's when we only had C64 as School Computers. But my first PC (386) already had an 3,5" Floppy Drive so I had 1.44MB and an huge 210MB HDD. Never got the HDD full by tha way...
Those are far far different from "Datasette-Tapes". Unless you were involved in mainframe data center work prior to 1995, you're unlikely to have ever encountered 9 track tapes.
If you have ever seen a movie from the 1970s or even 1980s where they show a 'computer room', they probably had big server racks of these types of drives. I think they appeared in several James Bond films.
The drive that I have is one of the most advanced ones ever built and comes from somewhere between 1983 and 1985. It likely cost the local university $20,000 +/- when they bought it new. I got it in a pallet of computing equipment at a university auction back in the late 90's.
We were using DLT tapes in around '95 for backup purposes (connected via SCSI to a server on a token ring network). Not sure how long those tapes were, but they held 10GB.