EXHIBIT 3.01

AMENDMENT NO. 1 TO

AMENDED AND RESTATED BYLAWS OF

ADAPTEC, INC.

The following sets forth Amendment No. 1 to the Amended and Restated Bylaws, dated as of May 18, 2006, of Adaptec, Inc., a Delaware corporation (the “Company”):

Pursuant to resolutions adopted by the Company’s Board of Directors on July 6, 2006, the first sentence of Article III, Section 3.2 of the Company’s Amended and Restated Bylaws, dated May 18, 2006, is hereby amended and restated, as of July 14, 2006, in its entirety to read as follows, effective upon acceptance by Judith M. O’Brien of her appointment to the Company’s Board:

“The authorized number of directors of the Company shall be ten (10).”

IN WITNESS WHEREOF, the undersigned has hereto subscribed his name this 14th day of July 2006.

/s/ Dennis DeBroeck

Dennis DeBroeck, Secretary