cbb2063e__SG_IO_ioctl_in_the_2_6_series_inimum_permission_requirements_Comments
[SCSI command] RECEIVE DIAGNOSTIC [(draft) standard] SPC-4 [sg driver requires] O_RDONLY CAP_SYS_RAWIO [Comments] 
the SES command set uses this command a lot. An SES device is only accessible via an sg device node
Linux SG_IO ioctl in the 2.6 series
Comments