DetailsIn high volume professional production environments where flexible storage is at a premium the Pro Caddy for Apple Mac Pro is a unique internal optical bay hard disk drive mounting solution. The Pro Caddy requires No Modification, No Replacement and No Dismantling of your Mac Pro. Using the existing optical bay housing the Pro Caddy enables the installation of one additional, bootable hard drive. Once installed, the Pro Caddy solution, frees up all four of the removable hard disk drives in the Mac Pro's factory bays. You have the freedom and convenience to use all four drives in flexible ways to boost productivity ( JBOD, Raid 0, RAID 1, or RAID 10). Important:SATA drive installed in Pro Caddy useses One of the SATA ports located on the Logic Board.