That was cool! So much has changed yet so much has stayed the same in so many ways.
I started my foray into the computer industry when that removable platter came out. My initial job was a PCB assembler building video terminal motherboards and power supplies. I moved up in the company I was at and eventually became a hardware tech that used to repair Phoenix and Hawk controller boards for removable hard drive platters, as well as controller boards for the Ontel line of terminals. In addition to the controller cards, I also used to calibrate the hard drives. These drives though were a bit bigger at 1.2 to 1.8 GB, and looked like a stack of plates in a plastic container. The repair was a pain in the backside too because it required special tools and jig and an oscilloscope to "set" the heads in the proper location in the drive. Once a specific pattern appeared on the scope screen, the drive was calibrated.
The big 8-inch floppy drives were very similar. The old Shugart drives had to be calibrated in the same fashion. They hand an inherent calibration problem due to the floppy spindle being belt-driven. Eventually the belt would stretch, and throw everything out of whack. The problem though is once a drive was calibrated any data written while it was going out of calibration was inaccessible due to the misaligned heads. Fast forward about 10 years to the early 1990s and we then had SyQuest removable cartridges. These were a great way to share media when the drives didn't lose calibration. The issue with these was the removable cartridges had aluminum platters that would expand or contract a little bit depending upon the temperature. They would work fine one day, but not the next and they couldn't very well be shared the way they were meant to be.
Then we have today with devices that are 16-300 times or more in parts that either barely move, or don't even move at all.
Anyway sorry for going on a tangent !
John