Exhibit 10.15 AMENDMENT NO. 3 TO OPTION AGREEMENT II * Portions of this document have been omitted and filed separately with the Securities and Exchange Commission pursuant to a request for confidential treatment. AMENDMENT This Amendment No. 3 to Option Agreement II (the "Amendment No. 3") is effective as of June 16, 2000 (the "Effective Date") by and between Adaptec Manufacturing (S) Pte. Ltd., a company organized under the laws of Singapore, with its current registered address at 6 Battery Road, 532-00, Singapore 049909 ("Customer"), and Taiwan Semiconductor Manufacturing Co., Ltd., a company organized under the laws of the Republic of China, with its registered address at No. 121 Park Avenue 3, Science-Based Industrial Park, Hsin-Chu, Taiwan, Republic of China ("TSMC"), for the purpose of amending the Option Agreement II entered into by Customer and TSMC on October 23, 1995 (the "Option Agreement II") as follows: 1. Replace Section 7(a) with the followings: "The term of this Agreement shall commence from the Effective Date, and continue until December 31, 2004." 2. Add the followings at Section 20: "Section 20 Non-Publicity (a) No publicity or information regarding the existence or contents of this Agreement shall be given or released by either party in any case, other than as required by law. In the event that any applicable law or regulation requires the disclosure of this Agreement, the disclosing party must provide details of the disclosure request prior to submission of such information to the requesting authority. (b) The exchange of information by either party for the purposes of review of the contents prior to disclosure as described in the foregoing Section 20(a) will be handled directly by the TSMC and Customer representatives responsible for official company communications and public relations: For TSMC Name: Ronald C. Norris Title: Senior Vice President, Worldwide Marketing and Sales Address: No. 121, Park Avenue 3, Science-Based Industrial Park, Hsin-Chu, Taiwan, Republic of China Telephone No: 011-886-3-578-0221 Fax No: 011-886-3-578-1545 Cc to: Name: David Keller Title: Senior Director, Account Management, TSMC NA Address: 1740 Technology Drive, Suite 660, San Jose, CA 95110, USA Telephone No: 408-487-4139 Fax No: 408-441-7713 For Customer 1 Name: Dolores Marciel Title: Vice President of Worldwide Material Address: 691 South Milpitas Boulevard, Milpitas, CA 95035, USA Telephone No: 408-945-8600 Fax No: 408-957-8227 (c) In the event that either party breaches Section 20(a) of this Agreement, the non-breaching party may terminate this Agreement immediately with a 180 days written notice to the breaching party pursuant to Section 7(c) of this Agreement." 3. Replace Exhibits B and D with the new Exhibits B and D attached hereto. 4. Customer agrees to pay to TSMC in cash the entire Option Fee for the year 2003 and 2004, total in the amount of US$20,000,000 as set forth in the new Exhibit D, by June 16, 2000. 5. All the other terms and conditions of the Option Agreement II shall remain unchanged to the extent not in conflict with the terms and conditions in this Amendment No. 3. Taiwan Semiconductor Adaptec Manufacturing (S) Pte. Ltd. Manufacturing Co., Ltd. /s/ Ronald C. Norris /s/ Kok Yong Lim - ------------------------------------ ------------------------------------ Name: Ronald C. Norris Name: Kok Yong Lim Title: Senior Vice President Title: Vice President Worldwide Marketing & Sales Manufacturing 2 Exhibit B CUSTOMER/TSMC COMMITTED CAPACITY Unit: K 6" Wafer Equivalent 2000 2001 2002 2003 2004 ---- ---- ---- ---- ---- Base Capacity [*] [*] [*] [*] [*] (For Options) X% of Base [*] [*] [*] [*] [*] Capacity Option [*] [*] [*] [*] [*] TSMC Committed Capacity [*] [*] [*] [*] [*] (Base Capacity + Option Capacity) Customer Committed Capacity [*] [*] [*] [*] [*] (X% Base Capacity + Option Capacity) Option Capacity [*] wafers times [*] per wafer = US $33.6 Million for years 1999 - - 2002 Option Capacity [*] wafers times [*] per wafer = US $20 Million for years 2003 and 2004 [*] Confidential information has been omitted and filed separately with the Securities and Exchange Commission pursuant to a request for confidential treatment. 3 Exhibit D OPTION FEE Year Option Capacity Option Fee Due Date (Unit: Wafer Equivalent) (Unit: US$) - ---------------------------------------------------------------------------------------------- 2000 [*] $8.4M Paid 2001 [*] $8.4M Paid 2002 [*] $8.4M Paid 2003 [*] $10M June 16, 2000 2004 [*] $10M June 16, 2000 [*] Confidential information has been omitted and filed separately with the Securities and Exchange Commission pursuant to a request for confidential treatment. 4