That is because /dev/sg0 is not a block device. Your cdrom is not being recognized because it is failing to initialize, the relevant error is:
TEST_UNIT_READY failed (err_mask=0x4)
That is because /dev/sg0 is not a block device. Your cdrom is not being recognized because it is failing to initialize, the relevant error is:
TEST_UNIT_READY failed (err_mask=0x4)