.\"	$NetBSD: fd.4,v 1.11 2010/03/22 18:58:31 joerg Exp $
.\"
.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
.\" All rights reserved.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Paul Kranenburg.
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.Dd June 23, 1996
.Dt FD 4 sun3
.Os
.Sh NAME
.Nm fd
.Nd Sun 3/80 i82027 floppy disk drive controller driver
.Sh SYNOPSIS
.Cd "fdc0 at obio0" Pq sun3x
.Cd "fd* at fdc0"
.Sh DESCRIPTION
The
.Nm
driver is for the built-in floppy diskette drive run by the
.Tn Intel
i82027 controller found on the Sun 3/80.
.Pp
Bits
.Bq 0-3
of the minor device number of the special files referring to this
device encode the floppy density as follows:
.Bl -tag -width indent -offset indent
.It 0
3.5'' 1.44MB floppy diskettes.
.It 1
3.5'' 720KB floppy diskettes.
.It 2
3.5'' 360KB floppy diskettes.
.It 3
3.5'' 1.2MB/NEC Japanese format floppy diskettes.
.El
.Sh FORMATTING
The driver supports floppy disk formatting using the interfaces in
.In sys/fdio.h :
.Pp
.Bl -tag -width FDIOCFORMAT_TRACK -compact
.It Dv FDIOCGETFORMAT Fa 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.
.Pp
.It Dv FDIOCSETFORMAT Fa struct fdformat_parms
Set formatting parameters.
The driver saves this state and it persists while the device is open.
.Pp
.It Dv FDIOCFORMAT_TRACK Fa struct fdformat_cmd
Format a track on the medium.
If this call returns
.Er EINVAL ,
the track formatting parameters were out of range for the medium.
If it returns
.Er EIO ,
there was a medium error while formatting the track.
.Pp
.It Dv FDIOCSETOPTS Fa int
Set driver options which persist until the device is closed.
The
options should be the logical OR of the desired values below:
.Pp
.Bl -tag -width FDOPT_NORETRY -compact
.It Dv FDOPT_NORETRY
Do not retry operations on failure
.It Dv FDOPT_SILENT
Do not print error messages to the console
.El
.Pp
.It Dv FDIOCGETOPTS Fa int
Fetch drive options.
.El
.Pp
A typical use of the formatting facilities would be to open the device,
call
.Dv FDIOCGETFORMAT
to fetch the current format parameters, perhaps
change a parameter or two, display the formatting details to the user,
and then call
.Dv FDIOCSETFORMAT
followed by a series of calls to
.Dv FDIOCFORMAT_TRACK .
.Sh SEE ALSO
.Xr eject 1 ,
.Xr fdformat 1
.Sh HISTORY
The
.Nm
formatting support appeared in
.Nx 1.3 .
.Sh BUGS
Formatting appears to not work reliably on all machines.