1 7 ▁CO O ▁David ▁Mos ley ▁was ▁appointed ▁CE O ▁and ▁Luc zo ▁stepped ▁down ▁from ▁that ▁role . ▁ ▁History ▁ ▁Se ag ate ▁developed ▁the ▁first ▁ 5 . 2 5 - inch ▁hard ▁disk ▁drive ▁( H DD ), ▁the ▁ 5 - m eg aby te ▁ST - 5 0 6 , ▁in ▁ 1 9 8 0 . ▁They ▁were ▁a ▁major ▁supp lier ▁in ▁the ▁micro comput er ▁market ▁during ▁the ▁ 1 9 8 0 s , ▁especially ▁after ▁the ▁introduction ▁of ▁the ▁IBM ▁X T ▁in ▁ 1 9 8 3 . ▁Today ▁Se ag ate , ▁along ▁with ▁its ▁compet itor ▁Western ▁Digital , ▁domin ates ▁the ▁H DD ▁market . ▁ ▁Much ▁of ▁their ▁growth ▁has ▁come ▁through ▁their ▁ac quisition ▁of ▁compet itors . ▁In ▁ 1 9 8 9 , ▁Se ag ate ▁acquired ▁Control ▁Data ▁Corporation ' s ▁Im prim is ▁division , ▁the ▁mak ers ▁of ▁CD C ' s ▁H DD ▁products . ▁Se ag ate ▁acquired ▁Con ner ▁Per i pher als ▁in ▁ 1 9 9 6 , ▁Ma xt or ▁in ▁ 2 0 0 6 ▁and ▁S amsung ' s ▁H DD ▁business ▁in ▁ 2 0 1 1 . ▁ ▁Found ing ▁as ▁Sh ug art ▁Technology ▁ ▁Se ag ate ▁Technology ▁( then ▁called ▁Sh ug art ▁Technology ) ▁was ▁incorpor ated ▁on ▁November ▁ 1 , ▁ 1 9 7 8 , ▁and ▁comm enced ▁operations ▁with ▁co - found