EX-4.8



 Exhibit 4.8 
 THE WESTERN DIGITAL CORPORATION 401(K) PLAN 
 Effective December 19, 2012, and except
as otherwise specified herein, the Western Digital Corporation 401(k) Plan (hereinafter referred to as the “Plan”) is hereby amended as provided herein. 
 WHEREAS, Western Digital Corporation (hereinafter referred to as the “Employer”) heretofore adopted the Plan effective January 1, 2010; and 

WHEREAS, the Plan consists of the Accudraft Prototype Defined Contribution Retirement Plan, Basic Plan Number #01 (hereinafter referred to as the
“Basic Plan Document”) and the Accudraft 401(k) Non Standardized Prototype Adoption Agreement #002 (hereinafter referred to as the “Adoption Agreement”); and 
 WHEREAS, the Basic Plan Document provides that the Employer may change the choice of options in the Adoption Agreement at any time; and 
 WHEREAS, the Employer desires to change the options in the Adoption Agreement as provided herein; 

NOW, THEREFORE, the Plan is hereby amended as follows: 
 First Change 
 On the Effective Date, Section 2.2 of the Adoption Agreement,
Plan Data, is hereby deleted in its entirety and shall read as follows: 
 Predecessor Service.
x Service with the following entity or entities will be credited as selected in (a), (b), (c), (d) and (e) below: (this section need only be completed if the Employer
does not maintain the plan of the predecessor employer) 
 Adaptive Data Systems, Inc., Faraday Electronics, Inc., Paradise Systems,
Inc., Verticom, Inc., Atasi, Tandon Corporation, ViaNetix, Inc., Senvid, Inc., Komag, Inc., Silicon Systems, Inc., HGST America., and Arkeia Software, Inc. 
  

			
	 (a) x
	 	Elective Deferrals, QMACs and QNECs. Service with an entity listed above will be given for eligibility purposes under Section 3.2(a) of the Adoption
Agreement.
		
	 (b)  ̈
	 	ADP Safe Harbor Contributions. Service with an entity listed above will be given for eligibility purposes under Section 3.2(b) of the Adoption
Agreement.
		
	 (c)  ̈
	 	 ACP Safe Harbor Matching Contributions. Service with an entity listed above will be credited for: (check all that
apply)
  
    ̈
Eligibility purposes under Section 3.2(c) of the Adoption Agreement
  

   ̈ Vesting purposes under Section 10.3 of the Adoption Agreement

		
	 (d) x
	 	 Non-Safe Harbor Matching Contributions. Service with an entity listed above will be credited for: (check all that
apply)
  
   x
Eligibility purposes under Section 3.2(d) of the Adoption Agreement
  

  x Vesting purposes under Section 10.4 of the Adoption Agreement

		
	 (e) x
	 	 Non-Safe Harbor Non-Elective Contributions. Service with an entity listed above will be credited for: (check all that
apply)
  
   x
Eligibility purposes under Section 3.2(e) of the Adoption Agreement
  

  x Vesting purposes under Section 10.5 of the Adoption Agreement









 In all other respects, the Plan is hereby ratified and affirmed. 

IN WITNESS WHEREOF, and as evidence of its adoption of this amendment to the Western Digital Corporation 401(k) Plan, the Employer has caused this
document to be executed by its duly authorized officers. 
  

									
		 		 		 	Western Digital Corporation
					
	Witness:	 	 /s/ Daphne Jernigan
	 		 	By:	 	 /s/ Jackie Demaria

	Print Name:	 	Daphne Jernigan	 		 	Print Name:	 	Jackie Demaria
		 		 		 	Title:	 	SVP, HR
		 		 		 	Date:	 	2/15/2013








 SUMMARY OF MATERIAL MODIFICATIONS 

 

			
	TO:	  	Plan Participants
		
	FROM:	  	Administrator of the Western Digital Corporation 401(k)
		
	DATE:	  	2/15/2013
		
	RE:	  	The Western Digital Corporation 401(k) Plan

 This Summary of Material Modifications (“SMM”) describes certain changes made to the Western Digital
Corporation 401(k) Plan (the “Plan”), effective December 19, 2012. 
 The “Rollover Contributions” provisions of the
Plan have been changed to reflect the following: 
 Predecessor Service will be credited for employees of Arkeia Software, Inc.

 Please staple this SMM to your copy of the Summary Plan Description for the Plan. If you have any questions about this SMM, please contact
the Plan Administrator designated in the Summary Plan Description.