DragonFly On-Line Manual Pages

FDC(4)                DragonFly Kernel Interfaces Manual                FDC(4)

NAME
     fdc -- PC architecture floppy disk controller driver

SYNOPSIS
     device fdc0 at isa? port IO_FD1 flags 0x1 irq 6 drq 2
     device fd0 at fdc0 drive 0
     device fd1 at fdc0 drive 1

DESCRIPTION
     This driver provides access to floppy disk drives and QIC40/80
     tapedrives.  In /dev for each floppy device a number of minor devices are
     present.  The /dev/fd* devices with trailing alphabetic characters are
     used to indicate `partitions' on the floppy disk.  The /dev/fd*.<number>
     are devices that indicate the size of the floppy disk (so: 720kB, 1440kB
     etc). The latter are used for formatting disks using fdformat or for
     accessing different density disks in multidensity drive.  Example: 720kB
     disk in a 1.44Mb drive.

     Normally, the driver will ask the system's CMOS memory to obtain the
     floppy drive configuration.  Some machines do not store any form of a
     configuration value in their CMOS.  Use the flags value `0x1' to pretend
     a 1.44 MB floppy drive as the first unit, without asking the CMOS for it.

     Normally, the device driver detects FDC chipsets that have an internal
     FIFO, and enables the FIFO on them.  There is a slight chance that this
     feature is actually misdetected (seen on an IBM Thinkpad 755c), so it can
     be turned off using flags `0x4'.

FILES
     /dev/fd*                          floppy disk device nodes
     /dev/fd*.<size in kB>             floppy disk device nodes where the
                                       trailing number indicates the floppy
                                       capacity
     /sys/config/X86_64_GENERIC        sample generic kernel config file
     /sys/dev/disk/fd/fd.c             floppy driver source

SEE ALSO
     fdformat(1), disktab(5)

DragonFly 4.1                    June 20, 2015                   DragonFly 4.1