https://www.theregister.co.uk/2018/10/23/seagate_and_western_digital_nearline_drive_neck_and_necking/

IDC has sent its analytical read-write heads skipping across the surface of the disk storage market and found Seagate shipped more drives than Western Digital in the third quarter.

The analysts estimated 98.4 to 101.0 million drives were shipped in the quarter. Aaron Rakers, a Wells Fargo senior analyst, who has seen the numbers, said that judging by the mid-points of the IDC per-vendor numbers, Western Digital shipped 37 to 38 million drives, Seagate 38 to 39 million and Toshiba 23 to 23.6 million.