Exhibit 21

QUANTUM CORPORATION

SUBSIDIARIES OF THE REGISTRANT

1	A.C.N. 120.786.012 Pty. Ltd., an Australian company
2	ADIC Limited, a UK corporation
3	Advanced Digital Information Corporation, a Washington Corporation
4	ATL Products Ltd., a United Kingdom corporation
5	Certance (US) Holdings, Inc., a Delaware corporation
6	Certance Holdings Corporation, a Delaware corporation
7	Certance International, a Cayman Islands company
8	Certance LLC, a Delaware limited liability company
9	Quantum Beteiligungs GmbH, a Germany corporation
10	Quantum Boehmenkirch GmbH & Co. KG, a Germany corporation
11	Quantum Distribution (UK) Limited, a United Kingdom corporation
12	Quantum GmbH, a German corporation
13	Quantum India Development Center Private Ltd., an Indian company
14	Quantum International Inc., a Delaware corporation
15	Quantum Korea Co. Ltd., a Korean corporation
16	Quantum Peripherals (Europe) SARL, a Swiss corporation
17	Quantum Peripherals (Malaysia) Sdn. Bhd., a Malaysian corporation
18	Quantum SARL, a French corporation
19	Quantum Storage Australia Pty. Ltd., an Australian corporation
20	Quantum Storage France, a French corporation
21	Quantum Storage GmbH., a Swiss corporation
22	Quantum Storage Japan Corporation, a Japanese corporation
23	Quantum Storage Singapore Pte. Ltd., a Singapore private company
24	Quantum Storage UK Ltd., a United Kingdom corporation
25	Rocksoft Pty. Ltd., an Australian company