Need ID for IBM Cards

On Mon, 13 Sep 1999, Wayne Smith wrote: office is throwing out and I found four cards that I need an ID on. They are the same size and shape as a standard puch card, but appear to be made of some sort of magnetic media. They are approximately the color of standard magnetic cassette tape on one side, and nearly black on the other. Each card has "IBM" printed on it in white with Are the cards notched on the sides? There were several semi-random access mass storage devices that used such cards... basically a magnetic analog of a punched card. Slightly off the topic: I saw an early IBM device called a STRAM (Selective Tape Random Access Memory) which used 2" wide tape loops of about 12" diameter... they were placed on a mandrel which stretched them into an oval for reading/writing. Also, IBM had an early office automation product called an MTST (Magnetic Tape Selectric Typewriter) which used early tape cartridges. Did not the RAMAC use magnetic cards? Somewhere around here I have a description of an IBM device that used individual magnetic cards... of course I can't find it... been re-arranging the library... it's Hell. Cheers John