The latest Apple computers and probably many other computers now contain Perpendicular Hard drives. this creates a more efficient use of disk space. Perpendicular drives are hard disk storage devices that store data bits vertically rather than “flat” or horizontally. Vertical storage allows for a ten-fold increase in data capacity while preserving data integrity. For a rough comparison, imagine a bookshelf with a single layer of books laid flat, end-to-end across the shelf. This represents the way traditional platters hold data bits. Now stand the books vertically and press them to one side, and you can fit many more books on the same size shelf. This is the basic principle behind perpendicular drives. For a more detailed analysis of Perpendicular drives read this
