here - OSTA - Optical Storage Technology Association

LVD
…
FSD (1,0)
…
Type 1 map (ref 0)
METADATA FILE
FILE ENTRY (A)
Allocation Descriptors
(0,16,64)
(0,256,32)
METADATA MIRROR
FILE ENTRY (C)
Allocation Descriptors
(0,X+1,96)
FSD (D)
…
Root Dir ICB (1,1)
Sys. Stream Dir ICB (1,2)
...
Type 2 map (ref 1)
Metadata Partition.
…
Duplicate MD Flag 1
MD File FE (0,0)
MD Mirror FE (0,X)
MD Bitmap FE (0,1)
...
MD BITMAP FILE
FILE ENTRY (B)
Allocation Descriptors
(immediate)
Extent addresses shown in form
(part ref, start lbn)
or... (part ref, start lbn, length (blocks))
Partition
unallocated
space
bitmap.
LBN 0
0 0 0 1 (unallocated)
0
LBN 16
LBN 256
LBN X
Physical
Partition
(ref 0)
A B
C
Metadata
Partition (ref 1)
(Metadata File)
=
(Metadata
Mirror File)
Metadata
Bitmap
File
S
B
D
LBN 0
0
D
1 (unallocated)
LBN 95
D
BIT 0
BIT 3
BIT 95
NOTE: Because the “Duplicate Metadata
Flag” is set in the metadata partition map,
the mirror file has it’s own unique
allocation. If this flag was not set, the Mirror
File FE ADs would reference the same
blocks as the Metadata File ADs.
NOTE: the LBN values used in the diagram above are for illustrative purposes only and
are not fixed. The partition references used are fixed as a consequence of the Metadata
Partition implementation.
A more detailed description of these files and how they are used follows in section
2.2.13.1.
UDF 2.01
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