Shops getting FIVE DOLLARS apiece for a 3-M floppy SSSD = 80 KILObytes, started the rumor that.. er the backside is often subtly defective, so mfg.s put the 'Good' side out for use. (The 'subtly' part meant to imply that, just because you could write to it and read it a couple dozen times: don't be fooled into thinking You're Getting Away With Anything!)

And it hasn't slowed even a tad: M$ .nyet proves it.
("Evidence Eliminator" proves the troops aren't any brighter, either.)