Using a SCSI drive
If you are using a SCSI drive, or an IDE drive under SCSI
emulation, Grip needs to access the generic scsi device in
addition to the cdrom device. On most systems, the generic scsi
device will be /dev/sgx, where 'x' is a number. Unless you have
multiple scsi devices, the device would be /dev/sg0. Ensure that
your user account has access to this device, and that this device
is specified in your rip configuration (see the Section called The "Rip" config tab in the chapter called Configuring Grip).