469 Million HDDs Shipped in 2015, 651 Million HDDs in 2010 – AnandTech

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Market Views: Hard Drive Shipments Drop by Nearly 17% in 2015
Shipments of PC components naturally dropped alongside weak PC sales, but HDD sales in particular have made for an interesting observation: for 2015, declines of HDD sales greatly outpaced the regress of the PC market. Based on estimates from Western Digital and Seagate, the total available market of HDDs contracted by nearly 100 million units year-over-year in 2015.