Only 3 big vendors left in hard drives!

http://en.wikipedia.org/wiki/List_of_defunct_hard_disk_manufacturers

Acquisition/merger charts of major brands

Seagate
|_____________________________________________________
|             |         |            |                |
Control Data  Conner    Maxtor       Samsung:2011     LaCie:2012
:1989         :1996     :2006            
                        |_____________ 
                        |             |
                        MiniScribe    Quantum
                        :1990         :2000 
                                      |____________
                                      |            |
                                      Plus:1992    DEC:1994

Western Digital
|_____________
|             |        
Tandon:1988   Hitachi:2012 (2.5″ & SSD)
              |
              IBM:2002

Toshiba
|_____________
|             |
Fujitsu:2009  Hitachi:2012 (3.5″ drives)
              |
              IBM:2002