dk(4)
- NetBSD Manual Pages
DK(4) NetBSD Kernel Interfaces Manual DK(4)
NAME
dk -- disk partition (wedge) driver
SYNOPSIS
options DKWEDGE_AUTODISCOVER
options DKWEDGE_METHOD_APPLE
options DKWEDGE_METHOD_BSDLABEL
options DKWEDGE_METHOD_GPT
options DKWEDGE_METHOD_MBR
options DKWEDGE_METHOD_RDB
options DKWEDGE_METHOD_TOS
DESCRIPTION
The dk driver provides a disk-like interface, or wedge, to an area of a
physical disk. Wedges may be configured manually with dkctl(8) or auto-
matically by the kernel upon the attachment of the physical disk.
Wedges need to have unique names. If a duplicate name is detected during
auto-discovery, that partition is ignored.
KERNEL OPTIONS
DKWEDGE_AUTODISCOVER
Automatically detect and configure wedges using any avail-
able methods. For each partition found, a wedge with a
corresponding name is created.
Currently only DKWEDGE_METHOD_GPT and DKWEDGE_METHOD_APPLE
are enabled by default.
DKWEDGE_METHOD_APPLE
Apple partition map detection method.
DKWEDGE_METHOD_BSDLABEL
BSD disklabel detection method. For each configured parti-
tion in the disklabel(5) that is not of type FS_UNUSED, a
wedge is created and named after the d_packname field fol-
lowed by `/' and the partition letter `a'..`p'.
When the d_packname is empty or has the value `fictitious',
the regular partition names are used as wedge names, i.e.
the device name, unit number and partition letter, for
example `wd0a'.
DKWEDGE_METHOD_GPT
Extensible Firmware Interface Globally Unique Identifier
Partition Table (GPT) detection method.
For every GPT partition a wedge is created and named after
the partition label. GPT partitions are UTF-16-encoded,
this is converted into UTF-8. If a partition has no label,
its UUID is used instead.
DKWEDGE_METHOD_MBR
IBM PC-compatible Master Boot Record (MBR) partitioning
detection method, with support for Extended MBRs.
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 `wd0e'. Primary
partitions start with `e', extended partitions start with
`i'.
DKWEDGE_METHOD_RDB
Amiga Rigid Disk Block (RDB) partitioning detection method.
DKWEDGE_METHOD_TOS
Atari's TOS partition map detection method.
For each partition, a wedge is created with a name of the
format ATARI_{type}_{number} where type may either be `GEM'
or `BGM'. The first partition typically corresponds to the
`C:' drive when read on an actual Atari, the second to `D:'
and so on. Extended partitions (those of type `XGM') are
not currently supported.
FILES
/dev/dk* Block mode dk device special files.
/dev/rdk* Raw mode dk device special files.
SEE ALSO
config(1), disklabel(8), dkctl(8), fdisk(8), gpt(8), MAKEDEV(8)
HISTORY
The dk driver first appeared in NetBSD 3.0.
AUTHORS
The dk driver was written by Jason R. Thorpe.
NetBSD 10.99 April 2, 2024 NetBSD 10.99
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