Follow-up Comment #3, bug #37067 (project grub):
Yes, the cd is hybrid filesystem(iso+udf).
But when grub2 detect fs in iso9660, it may read sector error. I remove the
iso9660 module when make uefi boot firmwareć
So grub2 will only recognize the cd in UDF, and booting linux no problem.
The total image is about 50MB, the file at the error sector is about 32MB.
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