Floppy drives did not use IDE, they used their own controller bus which was smaller with less pins than IDE. During the last days of the floppy drive, USB 1.1 was already going strong and motherboards stopped including floppy drive controllers… many hardware manufacturers transitioned to USB even for internal devices. Floppy drives became relegated to the same type of peripheral as mounted SD and other card readers… they all were mounted in the case, but connected to internal USB ports on motherboards over ribbon cables instead of the standard USB connectors.