UDF Revision 2.50 added the Metadata Partition facilitating metadata clustering, easier crash recovery and optional duplication of file system information: All metadata like nodes and directory contents are written on a separate partition which can optionally be mirrored. This format is used by some versions of Blu-ray discs.
WinISO places the metadata in front of the file data partition and mirrored metadata behind file data partition. They are separated as far as possible to avoid data losses, especially on an optical disc.
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