The IDE/ATAPI is a data interface that often is provided by PC manufacturers and, is generally included when you purchase a new computer. Usually, the computer motherboard comes with a primary and a secondary IDE bus. Up to two IDE/ATAPI devices, a master and a slave, can be connected to each bus. Because this interface is less sophisticated than the SCSI one, ATAPI devices are usually more affordable. Note, however, that often IDE/ATAPI devices are slower and, particularly in case of CD-Readers, less accurate. If you are considering using DiscJuggler with multiple recorders, SCSI is the preferred bus.