November 28, 1996 FDC 4 i386

### NAME

fdc - NEC 765 floppy disk controller driver

### SYNOPSIS

fdc0 at isa? port 0x3f0 irq 6 drq 2 fdc* at acpi? fdc* at pnpbios? index ? fd* at fdc? drive ?

### DESCRIPTION

The fdc driver provides support for the NEC 765 floppy disk controller and floppy disk drives, commonly found on IBM-PC compatible systems.

The driver supports the following floppy diskette formats by using particular partitions:

1.44MB 3.5-inch (b)
1.2MB 5.25-inch (c)
360KB 5.25-inch (1.2MB drive) (d)
360KB 5.25-inch (IBM-PC drive) (e)
720KB 3.5-inch (f)
720KB 5.25-inch (g)
360KB 3.5-inch (h)

Partition a selects the default format for the attached floppy drive, as determined by the BIOS configuration for the diskette drive.

### 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

fdformat(1), acpi(4), isa(4), pnpbios(4)

### HISTORY

The fdc formatting support appeared in NetBSD1.3.