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1. All disks shall be provided with a volume structure that complies with UDF Bridge format.

2. The logical sector size and the logical block size shall be 2048 bytes.

3. A DVD Read-Only disk shall consist of a single volume with a single partition per side. Therefore, the volume sequence number shall be 1 and the maximum volume sequence number shall be 1, and the Interchange Level shall be 2.

4. The logical block number defined by ECMA-119 shall be equal to the logical sector number and shall be different from the logical block number defined by UDF.

5. Anchor Volume Descriptor Pointers shall be recorded in the specified logical sectors having the logical sector number 256 and at least one of the last logical sector number or the last logical sector number – 256.

6. A Main Volume Descriptor Sequence and a Reserve Volume Descriptor Sequence shall be recorded in a volume.

7. The Terminating Descriptor shall be recorded to terminate an extent of a Volume Descriptor Sequence.

8. The Logical Volume Integrity Descriptor Sequence shall contain exactly one Close Logical Volume Integrity Descriptor and no Open Logical Volume Integrity Descriptor.

9. The Unallocated Space Table and the Unallocated Space Bitmap shall not be recorded, as DVD Read-Only disks have no space available for allocation.

10. The Freed Space Table and the Freed Space Bitmap shall not be recorded, as DVD Read-Only disks have no freed space.

1. All disks shall be provided with UDF file structure and ECMA-119 file structure.

2. Only Short Allocation Descriptors shall be used in the Allocation Descriptors field of the File Entry.

An example of a directory structure for DVD-Video and DVD-Audio is shown below.

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Last modified: June 01, 2004