https://finance.yahoo.com/news/western-digital-wdc-doomed-terrible-140002864.html
Most of the article highlights WDC difficulties and slugishness in current state. Seems HGST is the shining light and paving the way for a better future through acquisitions. At least in this writers opinion.
"Western Digital is significantly benefiting from synergies related to SanDisk and HGST acquisitions. The acquisition of SanDisk has opened new avenues of growth for Western Digital which has helped it boost market traction in the newer storage technology – SSD."