== FDC Track Format ==
[[File:FDC765 Track Format.png]]
Notes:
* The Index Address Mark (IAM) signifies the beginning of a track on a floppy disk.
* The ID Address Mark (IDAM) marks the beginning of a sector's header on a floppy disk.
* The Data Address Mark (DATA AM) marks the beginning of the actual data in a sector on the disk.
The CRC error-detecting code is initialised to FFFF. It is updated byte by byte and uses the CCITT-CRC16 algorithm. It is written after the ID and data fields of each sector in big-endian format (high byte first and then low byte).