dvdfs - The Digital Versatile Disk File System
Interfaces documented on this reference page conform to industry standards
Optical Storage Technology Association (OSTA) Universal Disk Format
(UDF) Specification, "OSTA UDF Compliant Domain", Version 2.00.
Information Processing-Volume and file structure of CD-ROM for infor-
Refer to the standards(5) reference page for more information about indus-
try standards and associated tags.
The Digital Versatile Disk File System enables the reading of disks format-
ted in the Universal Disk Format (UDF).
User data sectors in a DVD-ROM can contain any type of data in any format.
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 (Read-only):
Supports reading of UDF-formated files from DVD-ROM disks.
+ DVD-R (Write-once):
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 DVD-
At this time, the Tru64 UNIX dvdfs file system supports only the DVD-ROM
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 labeling
Commands: disklabel(8), mount(8)
Files: cdfs(4) fstab(4)