Exhibit 21
 
QUANTUM CORPORATION
 
SUBSIDIARIES OF THE REGISTRANT
 
  1       A.C.N. 120.786.012 Pty. Ltd., an Australian company
  2   Advanced Digital Information Corporation, a Washington Corporation
  3   Certance (US) Holdings, Inc., a Delaware corporation
  4   Certance Holdings Corporation, a Delaware corporation
  5   Certance LLC, a Delaware limited liability company
  6   Quantum Beteiligungs GmbH, a German corporation
  7   Quantum Boehmenkirch GmbH & Co. KG, a German corporation
  8   Quantum Distribution UK Ltd., a United Kingdom corporation
  9   Quantum GmbH, a German corporation
10   Quantum India Development Center Private Ltd., an Indian company
11   Quantum International Inc., a Delaware corporation
12   Quantum Korea Co. Ltd., a Korean corporation
13   Quantum Peripherals (Europe) SARL, a Swiss corporation
14   Quantum SARL, a French corporation
15   Quantum Storage Australia Pty. Ltd., an Australian corporation
16   Quantum Storage GmbH, a Swiss corporation
17   Quantum Storage Japan Corporation, a Japanese corporation
18   Quantum Storage Singapore Pte. Ltd., a Singapore private company
19   Quantum Storage UK Ltd., a United Kingdom corporation
20   Rocksoft Pty. Ltd., an Australian company