Copyright (c) 2006 The NetBSD Foundation, Inc.
All rights reserved.
This code is derived from software contributed to The NetBSD Foundation
by Jason R. Thorpe.
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Jonathan A. Kollasch used vnd(4) as the template for this man page.
.Dd April 2, 2024 .Dt DK 4 .Os .Sh NAME .Nm dk .Nd disk partition
q wedge driver .Sh SYNOPSIS .Cd "options DKWEDGE_AUTODISCOVER" .Cd "options DKWEDGE_METHOD_APPLE" .Cd "options DKWEDGE_METHOD_BSDLABEL" .Cd "options DKWEDGE_METHOD_GPT" .Cd "options DKWEDGE_METHOD_MBR" .Cd "options DKWEDGE_METHOD_RDB" .Cd "options DKWEDGE_METHOD_TOS" .Sh DESCRIPTION The .Nm driver provides a disk-like interface, or .Em wedge , to an area of a physical disk. Wedges may be configured manually with .Xr dkctl 8 or automatically by the kernel upon the attachment of the physical disk.
p
Wedges need to have unique names.
If a duplicate name is detected during
auto-discovery, that partition is ignored.
.Sh KERNEL OPTIONS
l -tag -width Dv
t Dv DKWEDGE_AUTODISCOVER Automatically detect and configure wedges using any available methods.
For each partition found, a wedge with a corresponding name is created.
p
Currently only
.Dv DKWEDGE_METHOD_GPT
and
.Dv DKWEDGE_METHOD_APPLE
are enabled by default.
t Dv DKWEDGE_METHOD_APPLE Apple partition map detection method.
t Dv DKWEDGE_METHOD_BSDLABEL .Tn BSD
disklabel detection method.
For each configured partition in the
.Xr disklabel 5
that is not of type
.Dv FS_UNUSED ,
a wedge is created and named after the
.Fa d_packname
field followed by
.Ql /
and the partition letter
.Sm off
.So Li a Sc .. So Li p Sc .
.Sm on
p
When the
.Fa d_packname
is empty or has the value
.Ql fictitious ,
the regular partition names
are used as wedge names, i.e. the device name, unit number and
partition letter, for example
.Ql wd0a .
t Dv DKWEDGE_METHOD_GPT Extensible Firmware Interface Globally Unique Identifier Partition Table
.Tn ( GPT )
detection method.
p
For every GPT partition a wedge is created and named after the
partition label.
GPT partitions are UTF-16\(enencoded, this is converted into UTF-8.
If a partition has no label, its UUID is used instead.
t Dv DKWEDGE_METHOD_MBR IBM PC-compatible Master Boot Record
.Tn ( MBR )
partitioning detection method, with support for Extended MBRs.
p
For every partition in the MBR a wedge is created and named like a
regular partition name, i.e. the device name, unit number and a
partition letter, for example
.Ql wd0e .
Primary partitions start with
.Ql e ,
extended partitions start with
.Ql i .
t Dv DKWEDGE_METHOD_RDB Amiga Rigid Disk Block
.Tn ( RDB )
partitioning detection method.
t Dv DKWEDGE_METHOD_TOS Atari's
.Tn TOS
partition map detection method, for disks that conform to Atari's AHDI
specification.
p For each partition, a wedge is created with a name of the format .Sm off .Li ATARI_ Bro Ar type Brc Li _ Bro Ar number Brc .Sm on where .Ar type may either be .Ql GEM or .Ql BGM . The number 0 partition typically corresponds to the .Ql C: drive when read on an actual Atari, the next to .Ql D: and so on. Extended partitions
q those of type Ql XGM are not currently supported. .El .Sh FILES l -tag -width Pa -compact t Pa /dev/dk* Block mode .Nm device special files. t Pa /dev/rdk* Raw mode .Nm device special files. .El .Sh SEE ALSO .Xr config 1 , .Xr disklabel 8 , .Xr dkctl 8 , .Xr fdisk 8 , .Xr gpt 8 , .Xr MAKEDEV 8 .Sh HISTORY The .Nm driver first appeared in .Nx 3.0 . .Sh AUTHORS The .Nm driver was written by .An Jason R. Thorpe .
Indexes created Tue Sep 23 02:09:52 GMT 2025