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Exhibit31.1
CERTIFICATION
I,StephenJ.Luczo,certifythat:
1. IhavereviewedthisannualreportonForm10-KofSeagateTechnologyplc;
2. Basedonmyknowledge,thisreportdoesnotcontainanyuntruestatementofamaterialfactoromittostateamaterialfactnecessarytomakethe
statementsmade,inlightofthecircumstancesunderwhichsuchstatementsweremade,notmisleadingwithrespecttotheperiodcoveredbythis
report;
3. Basedonmyknowledge,thefinancialstatements,andotherfinancialinformationincludedinthisreport,fairlypresentinallmaterialrespectsthe
financialcondition,resultsofoperationsandcashflowsoftheregistrantasof,andfor,theperiodspresentedinthisreport;
4. Theregistrant'sothercertifyingofficerandIareresponsibleforestablishingandmaintainingdisclosurecontrolsandprocedures(asdefinedin
ExchangeActRules13a-15(e)and15d-15(e))andinternalcontroloverfinancialreporting(asdefinedinExchangeActRules13a-15(f)and15d-
15(f))fortheregistrantandhave:
(a) designedsuchdisclosurecontrolsandprocedures,orcausedsuchdisclosurecontrolsandprocedurestobedesignedunderoursupervision,
toensurethatmaterialinformationrelatingtotheregistrant,includingitsconsolidatedsubsidiaries,ismadeknowntousbyotherswithin
thoseentities,particularlyduringtheperiodinwhichthisreportisbeingprepared;
(b) designedsuchinternalcontroloverfinancialreporting,orcausedsuchinternalcontroloverfinancialreportingtobedesignedunderour
supervision,toprovidereasonableassuranceregardingthereliabilityoffinancialreportingandthepreparationoffinancialstatementsfor
externalpurposesinaccordancewithgenerallyacceptedaccountingprinciples;
(c) evaluatedtheeffectivenessoftheregistrant'sdisclosurecontrolsandproceduresandpresentedinthisreportourconclusionsaboutthe
effectivenessofthedisclosurecontrolsandprocedures,asoftheendoftheperiodcoveredbythisreportbasedonsuchevaluation;and
(d) disclosedinthisreportanychangeintheregistrant'sinternalcontroloverfinancialreportingthatoccurredduringtheregistrant'smostrecent
fiscalquarter(theregistrant'sfourthfiscalquarterinthecaseofanannualreport)thathasmateriallyaffected,orisreasonablylikelyto
materiallyaffect,theregistrant'sinternalcontroloverfinancialreporting;and
5. Theregistrant'sothercertifyingofficerandIhavedisclosed,basedonourmostrecentevaluationofinternalcontroloverfinancialreporting,tothe
registrant'sauditorsandtheauditcommitteeoftheregistrant'sboardofdirectors(orpersonsperformingtheequivalentfunctions):
(a) allsignificantdeficienciesandmaterialweaknessesinthedesignoroperationofinternalcontroloverfinancialreportingwhichare
reasonablylikelytoadverselyaffecttheregistrant'sabilitytorecord,process,summarizeandreportfinancialinformation;and
(b) anyfraud,whetherornotmaterial,thatinvolvesmanagementorotheremployeeswhohaveasignificantroleintheregistrant'sinternal
controloverfinancialreporting.
August11,2015  /s/STEPHENJ.LUCZO
Name:  StephenJ.Luczo
 Title: ChiefExecutiveOfficer,DirectorandChairmanofthe
BoardofDirectors