The 4-pin power connector on a floppy drive is the standard power connector for floppy drives used in computers.
Molex 4-Pin to Floppy 3.25' Power Adapter Cable – 6 Inch P#693
Below is the complete pinout table for the standard 4-pin peripheral power connector for floppy drives (also called Berg or Mini-Molex connector) as of version 2.2 of the ATX specification (PDF).
Other ATX power connector pinouts, such as the 24-pin motherboard power connector and the 15-pin SATA power connector, can be found in our ATX power supply pinout tables list.
