Apple DVD Studio Pro 4 - Manual (Page 578)

Note: The type of DVD project you are creating, SD or HD, determines the type of volumes
that are created. SD projects create a UDF 1.02 volume and HD projects create a UDF 2.50
volume, regardless of the disc type actually being burned. UDF 2.50 volumes will not play
in current SD DVD players and are not supported by older computers, including those
running Mac OS X v10.3 Panther or earlier.
Filenaming Issues with Red Laser Media
A DVD-Video disc can contain several folders: VIDEO_TS, HVDVD_TS, AUDIO_TS, and
JACKET_P. The filenaming structure within these folders is very strict and tightly defined,
and conforms to the “8.3” specification. That is, only eight characters maximum are
allowed, followed by a three-character extension. The only allowed characters are
uppercase letters, numbers, and the underscore.
The names of files on a red laser disc are kept track of in two volumes—a UDF 1.02
(Universal Disc Format version 1.02) volume and an ISO 9660 volume, which together are
known as the UDF Bridge Format. The advantage of having the two volumes is that it
makes the DVD disc usable on a wider variety of playback devices. A potential disadvantage
is that each volume has its own filenaming rules. In the case of a DVD-Video disc, because
the only files present are those within the VIDEO_TS and AUDIO_TS folders, the names
in both volumes are identical.
A DVD-ROM disc also contains the VIDEO_TS and AUDIO_TS folders, and each must follow
the same strict filenaming rules that apply to a DVD-Video disc. The difference is that the
disc also contains folders and files outside of these normal DVD-Video folders. In addition,
a third volume, the Joliet volume, may be created.
As soon as you choose the DVD-ROM Content checkbox, the Joliet Extension Support
checkbox becomes active. Use this to control the filenaming conventions applied to those
nontraditional files.
The following sections describe the filenaming conventions that apply to the different
types of volumes on a DVD.
UDF 1.02 Volume
All SD DVDs using red laser media have a UDF 1.02 volume. The UDF volume always
supports long (up to 255 characters) Unicode filenames. Unicode is a double-byte system
allowing far more characters than the standard ASCII (single-byte) system. This is very
useful when you want to use Japanese characters, for example. It also supports folders
with extensions. Note that some operating systems prohibit the use of certain characters
( \ / ? : “ < > | ) in filenames. Standalone DVD players use the UDF volume to begin playing
a disc, but only to locate the first files. They never go beyond the VIDEO_TS and AUDIO_TS
directories. Macintosh computers using Mac OS 9 and Mac OS X use the UDF volume.
578 Chapter 22 Finishing a Project