All approved UDF 2.60 DCNs

All approved UDF 2.60 DCNs
Document: OSTA Universal Disk Format
Subject: Make UDF2.50 identical to UDF 2.60 for non-POW
Date: November 12, 2004; modified February 22, 2005;
DCN-5122
Description:
This DCN has consequences for the UDF 2.50 errata only, so no change for UDF 2.60.
It only proposes a few small modifications in existing DCNs. These modifications only
have an effect for the UDF 2.50 errata.
The goal is that UDF 2.50 together with the UDF 2.50 errata becomes ‘guaranteed
identical’ to UDF 2.60 for the non-Pseudo OverWrite (non-POW) case.
This can be achieved by a small modification in DCN-5102 and addition of DCN-5119 to
the UDF 2.50 errata. These modifications are explained here. After these modifications
are excecuted, this DCN-5122 can effectively disappear, but it is maintained in the set of
DCNs and UDF 2.50 errata as clarification.
None of these modifications have real implementation consequences for an existing UDF
implementation.
A Major benefit from this is that an implementer can use a single specification document
to implement both UDF 2.50 and 2.60, namely the UDF 2.60 spec, instead of going
through the 2.50 spec and all errata DCNs for implementing UDF 2.50. So UDF 2.50 and
2.60 can be implemented in one action.
The only thing that a UDF 2.50 implementer needs to know is that Pseudo OverWrite and
pseudo-overwritable partitions are not allowed in UDF 2.50 and that the UDF Revision
field in Domain Entity Identifiers and UDF Entity Identifiers must have a value #0250
instead of #0260 (see 2.1.5.3). This will be explained in the heading of the UDF 2.50
errata document, so a UDF 2.50 implementer can decide for himself whether to use the
UDF 2.50 + errata or the UDF 2.60 document.
What is needed to make (UDF 2.50 + errata) ‘guaranteed identical’ to (UDF 2.60 for
non-POW media)?
If we would add all DCNs to the UDF 2.50 errata, we would have proved that 2.50 plus
2.50 errata is identical to 2.60.
DCNs that cannot be added to the 2.50 errata are the POW related ones, so 5111, 5114
and 5116. There is only one non-POW related issue that is in DCN-5116. It is dealt with
below. Further, DCN-5120 is valid for UDF 2.60 only, so it does not make sense as UDF
2.50 errata.
All approved UDF 2.60 DCNs 62 February 28, 2005