UDFS(7FS) File Systems UDFS(7FS)


udfs - universal disk format file system


The udfs file system is a file system type that allows user access to
files on Universal Disk Format (UDF) disks from within the Solaris
operating environment. Once mounted, a udfs file system provides
standard Solaris file system operations and semantics. That is, users can
read files, write files, and list files in a directory on a UDF device
and applications can use standard UNIX system calls on these files and

Because udfs is a platform-independent file system, the same media can be
written to and read from by any operating system or vendor.

Mounting File Systems

udfs file systems are mounted using:

mount-F udfs -o rw/ro device-special


mount /udfs

if the /udfs and device special file /dev/dsk/c0t6d0s0 are valid and the
following line (or similar line) appears in your /etc/vfstab file:

/dev/dsk/c0t6d0s0 - /udfs udfs - no ro

The udfs file system provides read-only support for ROM, RAM, and
sequentially-recordable media and read-write support on RAM media.

The udfs file system also supports regular files, directories, and
symbolic links, as well as device nodes such as block, character, FIFO,
and Socket.


mount(1M), mount_udfs(1M), vfstab(4)


Invalid characters such as "NULL" and "/" and invalid file names such as
"." and ".." will be translated according to the following rule:

Replace the invalid character with an "_," then append the file name with
# followed by a 4 digit hex representation of the 16-bit CRC of the
original FileIdentifier. For example, the file name ".." will become

March 29, 1999 UDFS(7FS)