QUANTUM CORPORATION EXHIBIT 21 SUBSIDIARIES OF REGISTRANT 1. Quantum International, Inc., a California corporation 2. Quantum International DISC Inc., a California corporation 3. Quantum Foreign Sales Corporation, a Barbados corporation 4. Quantum GmbH, a German corporation 5. Quantum Peripheral Products, Ltd., a United Kingdom corporation 6. Quantum France SARL, a French corporation 7. Quantum Asia Pacific Pte., Ltd., a Singapore corporation 8. Quantum Peripherals Japan Corporation, a Japanese corporation 9. Quantum Data Storage B.V., a Netherlands corporation 10. Quantum Peripheral Products (Ireland), Ltd., an Ireland corporation 11. Quantum Peripherals (Europe) S.A., a Swiss corporation 12. Quantum Singapore Pte. Ltd., a Singapore corporation 13. Quantum Korea Corporation, a Korean corporation 14. Quantum Hong Kong, Ltd., a Hong Kong corporation 15. Quantum Peripherals (Malaysia) Sdn. Bhd., a Malaysian corporation 16. P.T. Quantum Peripherals Indonesia, an Indonesian corporation 17. Quantum Japan Procurement Center, Inc., a Japanese corporation 18. Quantum Storage (Malaysia) Sdn. Bhd., a Malaysian corporation 19. Quantum Peripherals Colorado, Inc., a Delaware corporation