Bernhard, > This is pretty curious in itself, because lsblk reports 4096 physical > sector size / 512 logical sector size and I would have thought > physical sector size and physical block size should be the same. Is > this a bug that should be reported? That's peculiar. What does: # dmesg | grep Optimal have to say? Also, please send the output of: # sg_readcap -l /dev/sdc # sg_vpd -p bl /dev/sdc Thanks! -- Martin K. Petersen Oracle Linux Engineering