About DVD-ROM Discs

You can create either DVD-Video or DVD-ROM discs with DVD Studio Pro.

DVD-ROM discs, also known as hybrid discs, play on standalone DVD players the same way DVD-Video discs do. When played on a computer, however, the additional files on the disc can be accessed, either directly or as part of a DVD@CCESS link. See DVD@CCESS for more information on DVD@CCESS.

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.

ISO 9660 Volume

All DVDs also have an ISO 9660 volume. This volume only supports filenames with single-byte ASCII characters. The ISO 9660 volume must conform to the “26.3” specification, similar to the “8.3” specification mentioned earlier (26 characters maximum followed by a 3-character extension; the only allowed characters are uppercase letters, numbers, and the underscore). In addition, folders cannot have extensions in their names. Filenames are automatically truncated and invalid characters replaced with an underscore. Filenames using double-byte characters exclusively are renamed as FILE_1, FILE_2, and so on.

Joliet Volume

Once you have selected the DVD-ROM Content checkbox, the Joliet Extension Support checkbox becomes active.

Important: The Joliet Extension Support checkbox is only applicable when writing to red laser media. It has no effect when writing to blue laser media.

Selecting the Joliet Extension Support checkbox forces the creation of the Joliet volume. This volume supports long Unicode filenames, just like the UDF volume, but has a limit of 110 characters. Folders with extensions are also supported. Filenames longer than 110 characters are automatically truncated. When not selected, the Joliet volume is not created.

Note: In rare cases, enabling the Joliet Extension Support checkbox and adding a number of files with extended character set names to the disc may create playback problems on some older DVD players. Select it only if you need to include such files and can test the disc on your intended players.

Filenaming Issues with Blue Laser Media

Blue laser media contains only one volume—a UDF 2.5 volume. For the purposes of filenaming, a UDF 2.5 volume has the same rules as the UDF 1.02 volume found on red laser DVDs. See UDF 1.02 Volume for more information.

Important: Older computer operating systems, including Mac OS X v10.3 Panther and earlier, and DVD players do not support UDF 2.5 volumes whether on red or blue laser discs.

Creating ROM-Only DVD Discs

You can use DVD Studio Pro to create DVD discs that contain only ROM data. The advantage of using DVD Studio Pro to do this (as opposed to using the Finder) is that, depending on whether you are using red laser or blue laser media, the volumes that are created are compatible with the DVD specification.

To create a ROM-only DVD disc
  1. Do one of the following:

    • Select the project’s name (next to the disc icon) in the Outline tab.

    • Click an empty area in the Graphical tab.

    The Disc Inspector appears.

  2. Click the General tab in the Disc Inspector.

  3. Select the SD DVD setting for DVD Standard to write to red laser media, or the HD DVD setting to write to blue laser media.

  4. Do one of the following:

    • Choose File > Advanced Burn > Format (or press Command-F).

    • Click Format in the toolbar.

    The format dialog appears.

    By default, DVD Studio Pro assumes you want to format the project that was built last. The settings in the format dialog are set to match the last build.

  5. Verify the settings in the Disc/Volume and Region/Copyright tabs are correct.

    This includes making sure the correct media type (red or blue laser) is selected as well as the layer options (single or dual).

  6. In the General tab’s Source section, do one of the following:

    • Use the Current Source pop-up menu (labeled “Choose”) to navigate to a folder without a VIDEO_TS or HVDVD_TS folder.

    • Highlight and delete the text displayed in the Location text entry area.

    An alert appears warning you that no DVD content could be found in that location.

  7. Configure the DVD-ROM Data section.

  8. Configure the Destination section in the General tab in the format dialog. This is where you select and configure the output type. See Output Type Settings for more information.

  9. Click Burn to start formatting the project if you are writing to DVD or DLT, or Format if you are writing to a hard disk.