Packet Writing
Packet writing was introduced in Revision 1.50. For write-once media, the entire disk is virtualized, making the write-once nature transparent for the user; the disk can be treated the same way one would treat a rewritable disc, but with steadily decreasing available space. For rewritable media, addresses are virtualized so that defect management (sector relocation) can be performed. However, UDF defect management does not apply to systems that already implement another form of defect management, such as Mount Rainier for optical discs, or a disk controller for a hard drive.
Incorrect or incomplete implementations of Revision 1.50 (or above) may result in compatibility problems due to improper virtualization in reading or writing the disk.
Read more about this topic: Universal Disk Format
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