| FDC(4) | Kernel Interfaces Manual (x86) | FDC(4) | 
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)
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1.2MB  5.25-inch (c)
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360KB  5.25-inch (1.2MB drive) (d)
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360KB  5.25-inch (IBM-PC drive) (e)
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720KB  3.5-inch (f)
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720KB  5.25-inch (g)
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- 
360KB  3.5-inch (h)
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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.
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FDIOCSETFORMAT struct fdformat_parms
- 
Set formatting parameters. The driver saves this state and it persists while the device is open.
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FDIOCFORMAT_TRACK struct fdformat_cmd
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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.
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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
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FDOPT_SILENT
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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.
 
HISTORY
 The fdc formatting support appeared in NetBSD 1.3.