All approved UDF 2.60 DCNs

All approved UDF 2.60 DCNs
Document: OSTA Universal Disk Format
Subject: Metadata Mirror File FEs and AEDs always far apart
Date: September 26, 2003
DCN-5106
Description:
Outcome of UDF Committee meeting September 15, 2003:
Not only the data for the Metadata File and its mirror must be located far apart, but also
their File Entries and possible Allocation Extent Descriptors. The latter does NOT
depend on the value of the Duplicate Metadata Flag.
This DCN is meant for the next UDF revision after 2.50 and for the UDF 2.50 errata.
Change:
In the NOTE after the second dotted list of 2.2.13.1 replace:
NOTE: In the case where the Duplicate Metadata Flag in the Metadata Partition Map is
set, the allocations for the Metadata File and Metadata Mirror File should be as far apart
(physically) as possible. Typically this is achieved by maximizing the difference between
the start LBNs of the extents belonging to the file and its mirror. Likewise the file entries
for these two files should be recorded as far apart as possible. Some drive/media …
by:
NOTE: The File Entry and possible Allocation Extent Descriptors of the Metadata File
should be recorded as far apart (physically) as possible from those of the Metadata Mirror
File. The same counts for the allocated extents of these two files in the case that the
Duplicate Metadata Flag in the Metadata Partition Map is set. Typically, recording far
apart is achieved by maximizing the difference between the start LBNs of the descriptors
and extents belonging to the file and its mirror. Some drive/media …
All approved UDF 2.60 DCNs 23 February 28, 2005