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Over the course of the HDD industry the shipped storage capacity has increased by something like 73% annually as shown in Figure 1.
FORBES: Have Hard Disk Drives Peaked?
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The National Center for Education Statistics (NCES) of the U.S. Department of Education reported that the proportion of U.S. children aged three to five who were enrolled in preprimary programs more than doubled between 1965 and 1990, and as shown in Figure 1, modest gains continued in the 1990s.
UNESCO: II Part Analytic Section
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If we assume 14% unit growth annually from 2013 through 2017 (which could be higher some years and lower in other years) the industry will grow from less than 600 M units in 2012 to over 1 B units shipped by 2016 or 2017 as shown in Figure 2.
FORBES: Have Hard Disk Drives Peaked?