It's pretty clear one company is making a terrible strategic error with their chosen technology funding. HAMR or MAMR. Or are both companies leadership full of hot helium? STX claims 2TB/sq.in. with MAMR isn't know to be possible, while WD says it is and it can scale to 4 TB/sq.in. WD says HAMR has a fundamental reliability limit, while STX says no problems with our design.
Who do you think is making a catastrophically bad decision? At least one company is, if not both.