I believe that I saw the first floppy disk drive invented at IBM San Jose in late 1969. It was designed to load microcode into the new selector channels being designed for the IBM S-370. Unlike the CPU's and selector channels of the S-360 that had a variety of ROM designs, the System 370 and the stand alone selector channels had writable control stores for microcode. The device was very primitive since it was essentially a read only device when installed in the channel. It was designed by Al Shugart or a team under his direction. I know he was credited with it within IBM. I have always hoped somebody would do an oral history with him of his IBM days and the reasons that he left to start his own company. Dean