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MOUNT_UDF(8) NetBSD System Manager's Manual MOUNT_UDF(8)
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mount_udf -- mount an UDF file system
mount_udf [-c] [-g gid] [-o options] [-t gmtoff] [-s session] [-u uid]
The mount_udf command attaches the UDF file system residing on the speci-
fied special device node on the location indicated with node.
Anonymous files stored on the UDF disc will be represented and saved in
the specified uid:gid pair. If unspecified, it will default to
nobody:nobody. Both uid and gid can be either specified with their names
as with their numerical equivalents.
-c Close the session after unmount creating remountable snap-
shots. Closing a session also allows -ROM devices to read
the disc created. Note that this option only makes sense
when mounting sequential recordable media like CD-R and
-g gid Set the group of anonymous files on the file system. The
default group is the nobody group.
-o options Use the specified mount options as specified in mount(8).
-s session Select the session session to be mounted instead of the
default last one. Implements readonly snapshots on sequen-
tial media. Positive session values indicate an absolute
session number. Negative session values are relative to the
last session found on the disc. Note that this option only
makes sense when mounting sequential recordable media like
CD-R and DVD*R.
-t gmtoff Set the time zone offset (in seconds) from UTC to gmtoff,
with positive values indicating east of the Prime Meridian.
If not set, the user's current time zone will be used.
-u uid Set the owner of anonymous files on the file system. The
default owner is the user nobody.
mount(2), vnd(4), fstab(5), mount(8), umount(8), vnconfig(8)
UDF is a file system defined by the OSTA standardization group and is
tailored for data interchange on optical discs (like CDs and DVDs)
between different operating systems. Its also more and more common on
other media like Compact Flash (CF) cards.
Read and write access is supported for all media types that CD/DVD type
drives can recognise including DVD-RAM. BluRay support is preliminary;
read-only access should work fine but write support is experimental.
Implemented and tested media types are CD-ROM, CD-R, CD-RW, CD-MRW, DVD-
ROM, DVD*R, DVD*RW, DVD+MRW, DVD-RAM but the same code can also read HD-
DVD and BluRay discs. Discs created and written by UDFclient, Nero's
InCD, and Roxio's DirectCD/Drag2Disc can be read without problems. Both
open and closed media are supported so there is no need to close discs or
All current UDF versions up to version 2.60 are supported.
Hard disk partitions and vnd(4) devices may also be mounted. Note when
mounting a vnd(4) device it might be necessary to specify the file image
sector size in the geomspec when creating the vnd(4) device or the disc
sector size will be used.
Write support for UDF version 2.50 is not completely mature and UDF ver-
sion 2.01 should be used if possible; this is also the default format.
Due to lack of test media and recording devices, BluRay support and in
particular BluRay-R is still preliminary as of writing.
NetBSD 7.0 July 13, 2009 NetBSD 7.0