This is especially problematic for the last bunch of floppies produced in the late 90s. According to some anecdotes, due to the popularity of PCs at this time,

This is especially problematic for the last bunch of floppies produced in the late 90s. According to some anecdotes, due to the popularity of PCs at this time, vendors implemented various cost-saving measures to drive the price down, as a result, the magnetic medium inside had the lowest quality in the entire history of floppy disks and extremely unreliable... Meanwhile, many 5-1/4 inch disks from old mainframes are still working today.