For those migrating to a new MacPro cylinder model, which has only a single internal drive, a SATA to Thunderbolt solution is needed to utilize existing SATA drives from old aluminum MacPro systems. Audio Perception highly recommends the OWC Thunderbay 4, which is a 4 bay SATA to Thunderbolt 2 chassis. This model is not a RAID unit, it is strictly a JBOD (just a bunch of drives) device. It can accommodate both 3.5” and 2.5” drives with adapter.