I remember seeing those at CompUSA. What was their advantage over using a hard drive? Was it common in business/academic machines for exchanging large files?
It was a portable hard drive where the media could be swapped out instantly (and so was also super-portable) just like a normal disk drive.
We used a set at the factory back in the day, practically up to the point where data sticks were invented. I still think some of our years are backed up on those discs in the safe! -- but we have no way to access them anymore, since the drives themselves are long gone.