Yep, the Wikipedia page: https://en.wikipedia.org/wiki/List_of_defunct_hard_disk_manufacturers https://en.wikipedia.org/wiki/List_of_defunct_hard_disk_manu...

Yep, the Wikipedia page: https://en.wikipedia.org/wiki/List_of_defunct_hard_disk_manufacturers https://en.wikipedia.org/wiki/List_of_defunct_hard_disk_manu... has an excellent "consolidation diagram": https://en.wikipedia.org/wiki/List_of_defunct_hard_disk_manufacturers#/media/File:Diagram_of_Hard_Disk_Drive_Manufacturer_Consolidation.svg https://en.wikipedia.org/wiki/List_of_defunct_hard_disk_manu...