Who invented floppy for IBM?

Answer 1

It was a team effort (no single person). This was an 8 inch diameter floppy without a jacket used to store the microprogram code for various models of the IBM System 370 computer (1971) and had a capacity of only 80KB. It was decided that these floppies did not have to be robust (and were practically considered disposable) as they would rarely be used more than once or twice a day when the computer was first powered on and would be stored away safely the rest of the time.

Later when floppies became a common data storage medium on small computers, the floppy had to be made much more robust and reliable and the capacity had to be increased. To improve robustness and reliability the 8 inch floppy was packaged in a stiff jacket with a fabric liner that would clean off and capture dust from the floppy surface. Higher recording density was used. The original FM coding used to read and write data was replaced with MFM coding to double the capacity and some drives could access both sides doubling the capacity again (the highest capacity double sided 8 inch diameter floppy could store 1MB).