There were talks about a merge around 2014, but it ultimately fell through. WD and Seagate are seperate companies.
BlueLagoon
Seagate and Western digital are two seperate companies. You're correct in that neither own or are affiliated with the other.
There were talks of a merger for years starting back in ~2014, but that fell through.
I did just find out that Seagate is the parent company to LaCie though. They used to (probably still do) make some decently tough external haard drives.
Even trying to buy anything from them directly is damn near impossible. Tried purchasing a desktop from their website a few weeks back, and the system wouldn't accept my address as valid. I talked to their support team, they told me they have to escalate it and I'd hear back in 24-48 hours.
Never heard back. Ended up going through Lenovo, and that was painless.
I used to almost exclusively recommend Asus or Lenovo to my family and friends, but I guess its just Lenovo now.
No, but Hitachi's was bought by WD back in 2011-2012. IIRC, they sold a part of it to Toshiba though.