May 12, 2007 FD 4 sparc

### NAME

fd, fdc - Sun SPARCstation i82072 or i82077 floppy disk controller driver

### SYNOPSIS

fdc0 at mainbus0 (sun4c) fdc0 at obio0 (sun4m) fd* at fdc0

### DESCRIPTION

This is the driver for the built-in floppy disk drive run by the Intel i82072 or i82077 controller chip found on the SPARCstation desktop systems, and other SPARC systems.

Bits [0-3] of the minor device number of the special files referring to this device encode the floppy density as follows:

0
  3.5'' 1.44MB floppy diskettes.

1
  3.5'' 720KB floppy diskettes.

2
  3.5'' 360KB floppy diskettes.

3
  3.5'' 1.2MB/NEC Japanese format floppy diskettes.

### FORMATTING

The driver supports floppy disk formatting using the interfaces in <```sys/fdio.h`>:

```FDIOCGETFORMAT````struct` `fdformat_parms`
  Fetch current formatting parameters. This gets the default parameters for the open device if no parameters have been set during the session.

```FDIOCSETFORMAT````struct` `fdformat_parms`
  Set formatting parameters. The driver saves this state and it persists while the device is open.

```FDIOCFORMAT_TRACK````struct` `fdformat_cmd`
  Format a track on the medium. If this call returns ```EINVAL`, the track formatting parameters were out of range for the medium. If it returns ```EIO`, there was a medium error while formatting the track.

```FDIOCSETOPTS````int`
  Set driver options which persist until the device is closed. The options should be the logical OR of the desired values below:

  ```FDOPT_NORETRY`
    Do not retry operations on failure
  ```FDOPT_SILENT`
    Do not print error messages to the console

```FDIOCGETOPTS````int`
  Fetch drive options.

A typical use of the formatting facilities would be to open the device, call ```FDIOCGETFORMAT` to fetch the current format parameters, perhaps change a parameter or two, display the formatting details to the user, and then call ```FDIOCSETFORMAT` followed by a series of calls to ```FDIOCFORMAT_TRACK`.

### SEE ALSO

eject(1), fdformat(1)

### HISTORY

The fd formatting support appeared in NetBSD1.3.