got this on two CDs, both were made after year 2003
both has offset -12, what's a bit unusual for Japan region
AFAICT only difference is that both SM bytes in 11th sector are set to 88 (Data=1;EOF=1)
and EDC/ECC changes accordingly. in every other way it's just like 'Jap EDC'
and also SM bytes in sector following right after system region hasn't got EOR bit set
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