dvdfs(4)dvdfs(4)NAMEdvdfs - The Digital Versatile Disk File System
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
Optical Storage Technology Association (OSTA) Universal Disk
Format (UDF) Specification, "OSTA UDF Compliant Domain", Version
Information Processing-Volume and file structure of CD-ROM for
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
The Digital Versatile Disk File System enables the reading of disks
formatted in the Universal Disk Format (UDF).
User data sectors in a DVD-ROM can contain any type of data in any for‐
mat. However, for Tru64 UNIX support through the dvdfs file system,
the OSTA UDF file format standard is mandatory. The file system limit
for DVDFS is int cfs_cdfs_mount_limit = 512.
Additionally, DVD-ROM standards require that the logical sector size
and the logical block (the user data block) size be 2048 bytes.
DVD support in the UDF specification includes these levels: DVD-ROM
Supports reading of UDF-formated files from DVD-ROM disks. DVD-
Supports the reading of UDF-formated files from a DVD-ROM disk
and supports writing, one time, UDF-formated files onto a DVD-
ROM disk. DVD-RAM (Rewritable):
Supports reading and writing of UDF-formated files from and to a
At this time, the Tru64 UNIX dvdfs file system supports only the DVD-
ROM (Read-only) format.
See mount(8) for information about mounting and unmounting a dvdfs file
system, fstab(4) for information about including dvdfs file system in a
system's /etc/fstab file, and disklabel(8) for information about label‐
ing DVD-ROM disks.
Commands: disklabel(8), mount(8)
Files: cdfs(4)fstab(4) delim off