KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and 
appoints each of Kenneth M. Massaroni, Roberta S. Cohen and Jolene A. Mendelsohn, signing singly, the 
undersigned's true and lawful attorney-in-fact to:

(1)	execute for and on behalf of the undersigned, in the undersigned's capacity as an 
officer and/or director of Seagate Technology plc(the "Company") or as a holder 
of 10% or more of the Company's securities, Forms 3, 4 and 5 in accordance 
with Section 16 of the Securities Exchange Act of 1934, as amended, and the 
rules thereunder;

(2)	do and perform any and all acts for and on behalf of the undersigned that may be 
necessary or desirable to complete and execute any such Form 3, 4 or 5 and 
timely file such form with the United States Securities and Exchange 
Commission and any stock exchange or similar authority; and 

(3)	take any other action of any type whatsoever in connection with the foregoing 
that, in the opinion of such attorney-in-fact, may be of benefit to, in the best 
interest of or legally required to be done by the undersigned, it being understood 
that the documents executed by such attorney-in-fact on behalf of the 
undersigned pursuant to this Power of Attorney shall be in such form and shall 
contain such terms and conditions as such attorney-in-fact may approve in such 
attorney-in-fact's discretion.

		The undersigned hereby grants to each such attorney-in-fact full power and authority to 
do and perform any and every act and thing whatsoever requisite, necessary or proper to be done in the 
exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the 
undersigned might or could do if personally present, with full power of substitution or revocation, hereby 
ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, 
shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein 
granted.  The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity 
at the request of the undersigned, are not assuming, nor is the Company assuming, any of the 
undersigned's responsibilities to comply with Section 16 of the Securities Exchange Act of 1934, as 
amended, and the rules thereunder.

		This Power of Attorney shall remain in full force and effect until the undersigned is no 
longer required to file Forms 3, 4 and 5 with respect to the undersigned's holdings of and transactions in 
securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered 
to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of the 
date written below.

Date:	April 28, 2012


/S/ William T Coleman III