When boot ArchLinux from Ventoy, it always print `Failed to open random seed file: write protected.` As Ventoy emulate the ISO file as a read-only CDROM, I didn't test with a real physical CDROM drive, but maybe it also has such problem. As we use `EFI_FILE_MODE_WRITE` to open the `loader\random-seed` file, so I think it's better to check the result with both `EFI_WRITE_PROTECTED` and `EFI_NOT_FOUND`.
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