A report on Floppy disk, Group coded recording and Floppy-disk controller

8-inch, 5¼-inch, and 3½-inch floppy disks
Zilog Z765A
8-inch, 5¼-inch (full height), and 3½-inch drives
5-1/4 Diskette Drive Adapter found on the IBM PC. This card is based on the NEC D765AC, the large chip at the top of the image.
A 3½-inch floppy disk removed from its housing
Block diagram showing FDC communication with the CPU and the FDD.
8-inch floppy disk, inserted in drive, (3½-inch floppy diskette, in front, shown for scale)
A setup disk of Japanese Microsoft Office 4.3, provided with 3.5" 1.2 MB and 1440 KB formats.
3½-inch, high-density floppy diskettes with adhesive labels affixed
Imation USB floppy drive, model 01946: an external drive that accepts high-density disks
Front and rear of a retail 3½-inch and 5¼-inch floppy disk cleaning kit, as sold in Australia at retailer Big W, circa early 1990s
Different data storage media (Examples include: Flash drive, CD, Tape drive, and CompactFlash)
A floppy hardware emulator, same size as a 3½-inch drive, provides a USB interface to the user
Screenshot depicting a floppy disk as "save" icon
Inside the 8-inch floppy disk
Disk notcher converts single-sided 5¼-inch diskettes to double-sided.
Rear side of a 3½-inch floppy disk in a transparent case, showing its internal parts
The spindle motor from a 3½‑inch unit
A read-write head from a 3½‑inch unit
How the read-write head is applied on the floppy
Visualization of magnetic information on floppy disk (image recorded with CMOS-MagView)
8-inch floppy disk
A 3 1⁄2-inch floppy disk drive
A box of about 80 floppy disks together with one USB memory stick. The stick is capable of holding over 130 times as much data as the entire box of disks put together.

A floppy-disk controller (FDC) is a special-purpose integrated circuit (IC or "chip") and associated disk controller circuitry that directs and controls reading from and writing to a computer's floppy disk drive (FDD).

- Floppy-disk controller

The others are different mainframe hard disk as well as floppy disk encoding methods used in some microcomputers until the late 1980s.

- Group coded recording

There were competing floppy disk formats, with hard- and soft-sector versions and encoding schemes such as differential Manchester encoding (DM), modified frequency modulation (MFM), M2FM and group coded recording (GCR).

- Floppy disk

Translate data bits into FM, MFM, M²FM, or GCR format to be able to record them

- Floppy-disk controller

Offering GCR-compatible diskette drives and floppy disk controllers (like the 100163-51-8 and 100163-52-6 ), Micropolis endorsed data encoding with group coded recording on 5¼-inch 100 tpi 77-track diskette drives to store twelve 512-byte sectors per track since 1977 or 1978.

- Group coded recording

Hardware floppy disk emulators can be made to interface floppy-disk controllers to a USB port that can be used for flash drives.

- Floppy disk
8-inch, 5¼-inch, and 3½-inch floppy disks

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