Hello,

Serious Weirdo wrote:
What is the correct sector size for Blu-rays? The data sector size is 2048
bytes, but the ECC sector size is 65536 bytes. Neither setting gives me an
error in -d mode.

I don't know, but if no errors happen, setting the sector size to 2048 or 65536 does not make a difference because ddrescue reads blocks of 65536 bytes by default during the copying phase; --cluster-size is adjusted accordingly:

'-c SECTORS'
'--cluster-size=SECTORS'
     Number of sectors to copy at a time. Defaults to 64 KiB / sector_size.


Best regards,
Antonio.

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