JESD218A-Solid-stateDrive(SSD)Requirementsand

JEDECSTANDARDSolid-StateDrive(SSD)RequirementsandEnduranceTestMethodJESD218A(RevisionofJESD218,September2010)FEBRUARY2011JEDECSOLIDSTATETECHNOLOGYASSOCIATIONNOTICEJEDECstandardsandpublicationscontainmaterialthathasbeenprepared,reviewed,andapprovedthroughtheJEDECBoardofDirectorslevelandsubsequentlyreviewedandapprovedbytheJEDEClegalcounsel.JEDECstandardsandpublicationsaredesignedtoservethepublicinterestthrougheliminatingmisunderstandingsbetweenmanufacturersandpurchasers,facilitatinginterchangeabilityandimprovementofproducts,andassistingthepurchaserinselectingandobtainingwithminimumdelaytheproperproductforusebythoseotherthanJEDECmembers,whetherthestandardistobeusedeitherdomesticallyorinternationally.JEDECstandardsandpublicationsareadoptedwithoutregardtowhetherornottheiradoptionmayinvolvepatentsorarticles,materials,orprocesses.BysuchactionJEDECdoesnotassumeanyliabilitytoanypatentowner,nordoesitassumeanyobligationwhatevertopartiesadoptingtheJEDECstandardsorpublications.TheinformationincludedinJEDECstandardsandpublicationsrepresentsasoundapproachtoproductspecificationandapplication,principallyfromthesolidstatedevicemanufacturerviewpoint.WithintheJEDECorganizationthereareprocedureswherebyaJEDECstandardorpublicationmaybefurtherprocessedandultimatelybecomeanANSIstandard.Noclaimstobeinconformancewiththisstandardmaybemadeunlessallrequirementsstatedinthestandardaremet.Inquiries,comments,andsuggestionsrelativetothecontentofthisJEDECstandardorpublicationshouldbeaddressedtoJEDECattheaddressbelow,orcall(703)907-7559or©JEDECSolidStateTechnologyAssociation20113103North10thStreetSuite240SouthArlington,VA22201-2107Thisdocumentmaybedownloadedfreeofcharge;howeverJEDECretainsthecopyrightonthismaterial.Bydownloadingthisfiletheindividualagreesnottochargefororreselltheresultingmaterial.PRICE:ContactJEDECPrintedintheU.S.A.AllrightsreservedPLEASE!DON’TVIOLATETHELAW!ThisdocumentiscopyrightedbyJEDECandmaynotbereproducedwithoutpermission.Organizationsmayobtainpermissiontoreproducealimitednumberofcopiesthroughenteringintoalicenseagreement.Forinformation,contact:JEDECSolidStateTechnologyAssociation3103North10thStreetSuite240SouthArlington,VA22201-2107orcall(703)907-7559JEDECStandardNo.218Page1SOLIDSTATEDRIVE(SSD)REQUIREMENTSANDENDURANCETESTMETHOD(FromJEDECBoardBallotJCB-10-53,andJCB-10-92,formulatedunderthecognizanceoftheJC-64.8SubcommitteeonSolidStateDrives.)1ScopeThisstandarddefinesJEDECrequirementsforsolidstatedrives.Foreachdefinedclassofsolidstatedrive,thestandarddefinestheconditionsofuseandthecorrespondingenduranceverificationrequirements.Althoughenduranceistoberatedbaseduponthestandardconditionsofusefortheclass,thestandardalsosetsoutrequirementsforpossibleadditionaluseconditionsasagreedtobetweenmanufacturerandpurchaser.Qualificationofasolidstatedriveinvolvesmanyfactorsbeyondenduranceandretention,sosuchqualificationisbeyondthescopeofthisstandard,butthisstandardissufficientfortheenduranceandretentionpartofadrivequalification.Thisstandardappliestoindividualproductsandalsotoqualificationfamiliesasdefinedinthisstandard.Thescopeofthisstandardincludessolidstatedrivesbasedonsolid-statenon-volatilememory(NVM).NANDFlashmemoryisthemostcommonformonmemoryusedinsolidstatedrivesatthetimeofthiswriting,andthisstandardemphasizescertainfeaturesofNAND.ThestandardisalsointendedtoapplytootherformsofNVM.2ReferenceDocumentsTherevisionofthereferenceddocumentsshallbethatwhichisineffectonthedateofthequalificationplan.JESD22-A117,ElectricallyErasableProgrammableROM(EEPROM)Program/EraseEnduranceandDataRetentionStressTestJESD47,Stress-Test-DrivenQualificationofIntegratedCircuitsJEP122,FailureMechanismsandModelsforSemiconductorDevicesJESD219,SolidStateDevices(SSD)EnduranceWorkloads3Terms,definitions,abbreviations,andtechnicalbackground3.1CyclingpoolEraseblocksusedbytheSSDduringread,write,oreraseoperationsataspecificpointintime.NOTETheSSDmayhaveadditionaleraseblocksbesidesthoseinthecurrentcyclingpoolthatmaybeusedassparesorforotherpurposes.Thecyclingpoolistypicallylargerthantheuser-accessibleLBAcount.JEDECStandardNo.218Page23Terms,definitions,abbreviations,andtechnicalbackground(cont’d)3.2DataErrorAtypeoffailureinwhichthedrivefailstoreturncorrectdatatothehost.NOTEOnedataerroroccursifareadofalogicalsectorcausesthedrivetoreturnanunrecoverableerrormessageortoreturnincorrectdata.Dataerrorsarecountedassucheveniftheyaretransient.See7.1.2forfurtherdiscussionofdataerrors.3.3DataRetentionTheabilityoftheSSDtoretaindataovertime.Synonymouswithretentioninthisdocument.3.4EnduranceTheabilityofanSSDtowithstandmultipledatarewrites.3.5EndurancefailureAfailurethatiscausedbyendurancestressing.NOTE1Endurancefailuresmaybedataerrortypesorfunctionalfailuretypes,asdescribedabove.NOTE2Inanendurancestress,somefailuresmayoccurthatareunrelatedtoendurance.Forexample,asolderjointcouldfail.Afailureisconsideredunrelatedtoenduranceifitwasnotcausedbytheendurancestressitself(i.e.,ifitwasnotcausedbytherepetitivewritingofdatatothedrive).Suchnon-endurancefailuresarenotconsideredas