UDF : Computer Hardware Buyers’ Glossary

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UDF
aka ECMA-167. UDF means Universal Disk Format. It is a CD and DVD format that allows you to treat a re-writeable CD like a hard disk, replacing files, and gradually adding to the disc. You can’t play UDF discs in audio CD players. You can’t read them on older OSes. For write-once discs, or broad compatibility, you should use one of the older disc-at-once formats, such as ISO 9660. For discs you will only be using yourself, UDF is more convenient. CDs can be either ISO-9660 or UDF format. UDF packs more data onto a CD. Windows Live File System usen UDF to allow you to incrementally add files to a CD/DVD write that writing the whole disk at once.

DVDs are UDF format. UDF comes in many versions 1.0, 1.02, 1.5, 2.0, to 2.01. Not all players support all versions, so for compatibility, you often deliberately use an old version.

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Wikipedia on UDF: Universal Disk Format
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