That's
really strange, because 3M and Scotch are the same company.
I know, but I think that Scotch was the low-cost brand of the 3M company.
BTW the original IBM data cartridges for the IBM 51x0 have been produced
by 3M, too. You can see the small 3M logo embossed into the metal plate.
These "IBM" cartidges are all fine, too (except for the belt...), so
they are of 3M instead of Scotch quality.
[Maybe Scotch used their adhesive tape as base for the
data cartridges
;-))]
Have you ever played with rust-covered scotch tape in a reel-to-reel
tape player? It works surprisingly well.
Peace... Sridhar