The ODS-L60E is a 61-slot expansion unit for the ODS-L30M master library unit that expands the capacity of the PetaSite Optical Disc Archive scalable library for broadcast, post production, editing and desktop operations. The unit holds up to four Optical Disc Archive drives, such as the ODS-D77F, a maximum of 61 cartridges, and a built-in robotic mechanism in a 7U, 19-inch rack-mountable chassis.