Minimum quality of recorded information

Symbol Error Rate
For checking the quality of the disc, including defects, the area for determining the SER shall be
written with arbitrary user data.

The quality of continuously and discontinuously written sequences
Random SER averaged over any 10000 consecutive LDC Blocks with the condition that all blocks are
recorded in a continuously written sequence,

Random SER < 2.0*10E-4 averaged over any 10000 consecutive LDC Blocks with the condition that all
blocks are recorded by single written recording unit block mode

Maximum burst errors
In each Recording Unit Block the number of burst errors with a length ? 40 bytes shall be less than 8
and the sum of the lengths of these burst errors shall be ? 600 bytes.

User-written data
The user-written data in a Recording Unit Block (RUB) as read in the HF read channel shall not

except those RUBs that have been replaced using Defect Management.

c Copyright Blu-ray Disc Association 2008. All rights reservedDefinition of signals

Byte error:
A byte error occurs when one or more bits in a byte have a wrong value, as detected by the related
error detection and/or correction circuits.

Burst error:
A sequence of bytes where there are not more than two correct bytes between any two erroneous
bytes. For determining the burst errors, the bytes shall be ordered in the same sequence as they are
recorded on the disc
The length of the burst is defined as the total number of bytes counted from the first erroneous byte
that is separated by at least three correct bytes from the last preceding erroneous byte, until the last
erroneous byte that is separated by at least three correct bytes from the first succeeding erroneous
byte.
The number of erroneous bytes in a burst is defined as the actual number of bytes in that burst that is
not correct.

Symbol Error Rate:
The Symbol Error Rate (SER) averaged over N LDC Blocks is defined as the total number of all
erroneous bytes in the related LDC Blocks divided by the total number of bytes in those LDC Blocks:

Random Symbol Error Rate:
The Random Symbol Error Rate is defined as the Symbol Error Rate where all erroneous bytes
contained in burst errors of which the length is ? 40 bytes are excluded from counting as well in the
numerator as in the denominator of the SER calculation: