What does FDD (in Computer) routine?

What does FDD (in Computer) routine?

it vehicle FLOPPY DISK DRIVE...

A floppy disk is a data storage device specifically composed of a disk of thin, flexible (floppy) compelling storage medium encased within a square or rectangular plastic shell. Floppy disks are read and written by a floppy disk drive or FDD, the initials of which should not be confused with fixed disk drive, which is another permanent status for a hard disk drive. Developed surrounded by 1969 by IBM, floppy disks in both 3.5 and 5.25 formats enjoy many years as a popular and universal form of storage, from the early 1980s to the deferred 1990s. However, they have very soon been largely superseded by Flash and optical storage devices
Floppy Disc Drive
Floppy Disk Drive
FDD may refer to a computer Floppy Disk Drive