EXHIBIT 21.1 SUBSIDIARIES OF REGISTRANT The following is a list of the Corporation's consolidated subsidiaries as of January 31, 2000. The Corporation owns, directly or indirectly, 100% of the voting securities of each subsidiary, unless noted otherwise and except for director's qualifying shares. NAME STATE OR JURISDICTION OF ORGANIZATION Asia Data General Corp. Delaware Conley Corporation Delaware China Data General Corp. Delaware CLARiiON Storage Systems, Inc. Delaware D G Foreign Sales Corp. Barbados D.G. Venezuela, C.A. Venezuela Datagen, Inc. Delaware Data General AB Sweden Data General A.G. Switzerland Data General A/S Denmark Data General A/S Norway Data General Africa SARL Africa Data General Argentina S.A. Argentina Data General Australia Pty., Ltd. Australia Data General Bahamas Limited Bahamas Data General BVI Ltd. British Virgin Island Data General Canada Canada Data General Chile S.A. Chile Data General (Canada) Company Canada Data General Computers Hungary Ltd. Hungary Data General Computers Sdn Bhd Malaysia Data General de Mexico S.A. de C.V. Mexico Data General Del Peru, S.A. Peru Data General do Brasil LTDA Brazil Data General France S.A.S. France Data General Gesellschaft mbH Austria Data General GmbH Germany Data General Hong Kong Sales & Service Limited Hong Kong Data General Hong Kong, Limited Hong Kong Data General International Inc. Delaware Data General International Manufacturing Pte., Ltd. Singapore Data General International Sales Corp. Delaware Data General Investment Corp. Delaware Data General Ireland Limited Ireland Data General Israel, Ltd. Israel Data General Japan YK Japan Data General Korea Ltd. Korea Data General Latin America, Inc. Delaware Data General Limited United Kingdom Data General Nederland BV The Netherlands Data General New Zealand, Limited New Zealand Data General Puerto Rico, Inc. Delaware Data General S.A. Belgium Data General S.A. Spain Data General S.r.l. Italy Data General Singapore Pte.Ltd. Singapore Data General South Africa (Proprietary) Limited South Africa Data General Systems (Thailand) Limited Thailand Data General Technology (1990) Ltd. Israel Data General Telecommunications, Inc. Delaware Digital Computer Controls, Inc. Delaware EMC (Benelux) B.V. The Netherlands EMC Computer Storage Systems (Israel) Ltd. Israel EMC Computer Storage Systems (Sales and Services) Ltd Israel EMC Computer Systems AG Switzerland EMC Computer Systems Argentina S.A. Argentina EMC Computer-Systems A/S Denmark EMC Computer-Systems AS Norway EMC Computer Systems Austria GmbH Austria EMC Computer Systems (Benelux) B.V. The Netherlands EMC Computer-Systems Brazil Ltda. Brazil EMC Computer Systems California, Inc Delaware EMC Computer-Systems Deutschland GmbH Germany EMC Computer Systems (F.E.) Ltd. Hong Kong EMC Computer Systems France S.A. France EMC Computer-Systems Ireland Limited Ireland EMC Computer Systems Italia S.p.A. Italy EMC Computer-Systems OY Finland EMC Computer Systems Philippines, Inc. Philippines EMC Computer Systems Poland Poland EMC Computer Systems (S.A.) (Pty.) Ltd. South Africa EMC Computer Systems (South Asia) Pte. Ltd. Singapore EMC Computer Systems Spain S.L. Spain EMC Computer-Systems Svenska AB Sweden EMC Computer Systems (U.K.) Limited United Kingdom EMC Computer Systems Venezuela, S.A. Venezuela EMC Corporation of Canada Canada EMC Foreign Sales Corporation (F.S.C.) Barbados EMC International Holdings, Inc. Delaware EMC Japan K.K.* Japan EMC Securities Corporation Massachusetts Epoch, Inc. Delaware General Risk Insurance Company Ltd. (DG) Bermuda Hankook EMC Computer Systems Chusik Hoesa South Korea M.C.I. Management and Computer Consulting Canada, Inc. Canada M.C.I. Management and Computer Consulting, Inc. Canada M.C.I. Management and Computer Consulting International, Inc. Canada MCI S.A. France Management Consulting & Informatic Ltd. Israel McDATA Asia Pacific Pte. Ltd. Singapore McDATA Corporation** Delaware McDATA Holdings Corporation Delaware McDATA International Inc. U.S. Virgin Islands Millennia III, Inc. Delaware P2I France Softworks, Inc. Delaware Terascape Software Inc. Massachusetts - ----------------------------- * 95% owned by EMC Corporation. ** 81% owned by McDATA Holdings Corporation.