The new MCE OptiBay Hard Drive was created for those users who want as much hard drive space as possible inside their MacBook Pro, MacBook, or PowerBook G4. Period. The MCE OptiBay Hard Drive replaces your internal SuperDrive or Combo drive with a high performance hard drive resulting in unheard of capacities in laptop hard drive space for all your projects... digital video, music, photos, etc. Two bootable hard drives inside your system open up a whole world of freedom and flexibility never before experienced in a Mac laptop... Scratch disk/System disk, RAID configurations, "System-dedicated" drives, and more. Plus, each OptiBay Hard Drive includes a portable enclosure for your SuperDrive or Combo drive so you'll still be able to use it anytime you want for loading system software or applications, as well as burning, playing, or ripping CDs and DVDs!...