mount_udf(8) - NetBSD Manual Pages

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MOUNT_UDF(8)            NetBSD System Manager's Manual            MOUNT_UDF(8)


NAME

     mount_udf -- mount an UDF file system


SYNOPSIS

     mount_udf [-c] [-g gid] [-o options] [-t gmtoff] [-s session] [-u uid]
               special node


DESCRIPTION

     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
                 DVD*R.

     -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.


SEE ALSO

     mount(2), vnd(4), fstab(5), mount(8), umount(8), vnconfig(8)


NOTES

     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
     sessions.

     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.


BUGS

     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.

     Disk space accounting is not upto par and care should be taken not to
     write too much on a disk.

     Due to lack of test media and recording devices, BluRay support and in
     particular BluRay-R is still preliminary as of writing.

NetBSD 5.1                     February 8, 2009                     NetBSD 5.1