"TrendFocus said Seagate was the quarter champion, pumping out 36.75 million drives, down 8 per cent annually. The research house said rival Western Digital had shipped 30.5 million, down 28 per cent on the year and an 11 per cent quarterly decline from (we calculated) about 34.3 million."
https://www.theregister.co.uk/2019/01/10/disk_drive_unit_ships_down/