Why Has Western Digital's Hard Drive Revenue Dropped 35% Over The Past 5 Years, Despite 50% Growth In Exabytes Shipped?

Western Digital (NASDAQ: WDC) has seen a steady growth in number of hard disk exabytes sold over the past 5 years, rising from 249 EB in 2015 to 383 EB in 2019, a growth of over 50%. (1 exabyte = 1 million terabytes). Over the same period, Western Digital's hard disk drive revenue has dropped...