In cdrtools, burning optical media (such as CDs, DVDs and Blu-rays discs) is done through the SCSI interface. Users of systems with more than one burning device need to provide a SCSI device (which is identified by a triplet of numbers, codice_6). Users of systems with only one burning device, however, do not need to specify the SCSI device since cdrtools is able to find it. By 2002 more and more burners were using the ATAPI interface. Linux 2.6 allowed the users to detect the SCSI ID of a device from its UNIX device path (codice_7) and a patch was published that made identifying the burner device for cdrecord simpler by allowing the user to specify the codice_7 device name (or even default to a udev managed link such as codice_9). Schilling, however, rejected this approach as well as other modifications used by Linux distributions, with the rationale that it would make the software more complex and less portable as this function was not available on other UNIX systems. Linus Torvalds states that SCSI LUNs should not be used for addressing devices on Linux, because these numbers are not unique, and do not make sense for many devices anymore (many devices will report codice_10 fake numbers). Instead Torvalds recommends that devices should be addressed via their UUID, physical connection, or an alias symlink as managed by udev on Linux.