hesela.devUniversal Disk Format (UDF)
Universal Disk Format is a filesystem specification based on ECMA-167 for interoperable file exchange across storage media.
UDF constrains and extends ECMA-167 structures for interchange. It is a filesystem format, not a synonym for DVD or Blu-ray media. [1]
Reading and writing have separate compatibility requirements. UDF 2.60 records minimum read, minimum write and maximum write revisions; its restrictions permit conforming 2.60 media to be read by 2.50 readers. An exact match to the writer's revision number is therefore not the compatibility rule. [2]
Write access depends jointly on filesystem access type and media/drive capabilities; unsupported writing can require read-only access. Identify the actual reader, supported features and recording state before attributing an access failure to aging. [2] [3]
Relations
Citations
- Ecma International: ECMA TR/112-1 (2023), introduction to the preserved OSTA UDF specifications
- OSTA: UDF 2.60 (2005), sections 2, 2.2.6.4 and 2.2.14.2, preserved as ECMA TR/112-2 (2023)
- Hesela: optical archival storage and preservation checks
Sources & caveats
- The revision example is UDF 2.60 dated 1 March 2005, republished by Ecma in 2023; it is not a new 2023 UDF revision.