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HGST's slice of the pie has dropped to under 20% as well, though the yearly fluctuations are relatively flat compared to the other brands.
You can't buy HGST drives, any more.

Western Digital bought them about a decade ago. For a while, the merger got held up by regulatory agencies, but commenced about 5 years ago. There was a period of time when some WD-branded drives were HGST, while others weren't. However, the time of separate hard drive engineering groups at WD seems to have long passed.