Btw. hdparm is of version 9.43-5.1.2. sgio.c of hdparm uses status directly which seems wrong from reading - http://www.tldp.org/HOWTO/SCSI-Generic-HOWTO/x255.html - http://www.tldp.org/HOWTO/archived/SCSI-Programming-HOWTO/SCSI-Programming-HOWTO-21.html Thus it seems as if the actual status was 0x1 = SG_CHECK_CONDITION.