Figure 2 in the accompanying power point file shows historical storagearealdensity (AD) growth for HDDs (this is directly related to the amount of digital storage that can be put on a disk in a hard disk drive) from Q1 2000 through Q1 2011.
Providing this storage capacity with HDDs and with slower arealdensity growth than in the past will require more HDD components and a major investment in HDD component capital equipment.