index HDDvsSSD Introduction L architecturedeshdd Philosophie Exemplesd utilisations Conclusion
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1 L eb anc HDDSSD Souenc ompa é u un qu è omme c ade a e e, nouaonenquê é u eu f onc onnemen dan ad edu oc kagededonnée. L e eb anc éd gépada al abcen e on é éc ha geab eg a u emendepu e e n e newww. da a abc en e. f.ce e peu enme e en a ande nf o ma on,de hno og eoud on e ba é u ex pé enc edememb edu abo a o e. T ou e ep oduc on n e d e an au o a on de au eu.t oud o é e é.u a on n e d ede mage, ex ee ogo, p o égé oucopy gh Da al abcen e
2 ndex Inoducon LachuedeSSD LachuedeHDD Phoophe Exempeduaon Concuon HDDSSD
3 Lebanc HDDSSD Laboaoedeécupéaondedonnée Inoducon Loduempacemendunodnaeuouéouondeu-c,ou héezeneeadonnedqueduhddde2toouunssdde512go pouyogeonoueedonnée.indéceneedeuxmodèe,ou demandezconeauendeuquouéponda: - PenezeSSD,ceunpeupuchemacepufabeeeyème dexpoaondémaeabeaucouppuapdemen. Pufabe?Puapde?Cequenouaonéfedancee!
4 HDDSSD LachuededqueSSD En 2008 a débué nduaaon du SSD,nommé comme e empaçandu dque dumécanque à paeaux. SLC MLC TLC Dégné comme un noueau maché daen,de nombeueocééeonancéedanaenue(ou pouepuancenneonéoenéeupoducon) afndobenune padumaché.conaemenaux dque du à paeaux podu paaujoudhu3 fabcan,enombedefabcandepucemémoee compenpacenaneee déenune éabe gueedepx. Lodomba px,capacé,quaé,efabcan ondûfaeéoueeuhnoogeaeemp. LhoeduSSD emaquéepa3éouondee pucenandnomméeslc,mlcetlc. Lepemèepuce NAND e nommen deslc(sngelaye Ce),o ceue à mpe couche.ce pucepemeende mémoeéadun bdedonnée(o1, o0). Rapdemen,eSLC fuenboquéephyquemenenepace de ockage. Le pucemlc (Mupe LayeCe)onappauepououon nee pobème de SLC,en ne ockan paéadunbde donnée ma de deux. CommepoueSLC, aeempeuaeu demanden depuenpudapacé de ockage. Aujoudhuahnoogeapuécene, etlc (TpeLaye Ce) pemeen de ocke3bdedonnéedane même epacedeockage
5 HDDSSD LachuededqueSSD SLC Cepucepemeendemémoeéa1ou0.Enockanunquemendeuxéapobe,unnombe mpoandepucemémoeeequpoucéeunéubouunssddegandapacé. Loûdefabcaondunmédadegandapacéeaopohbfpouegandpubc.Endehodun pobèmedoû,apuceauneongueduéedee. Enanayanongnauuneéede12b,noupouonobenacoub-cone. MLC LeMLCpemeendemémoe4éa 1,10,01ou00.Ceenoueehnoogeacéédenoueaux pobème:eeeudeue.lefadompmeegnapoue4éadanemêmeepacede ockage(mêmedmenondepuce)peugénéedeeeu.paexempeaaeedeue,ungna 01peupafoêonfonduaun10.Pouendeepobèmenbepouuaeu,efabcanon ajouédeecc(codedoondeeu). PouéceamêmedonnéeuunepuceSLCeunepuceMLC,apuceMLCeffuea+dopéaon,e aduanpauneduéedeepucoueenconepaedunapacéagemenaccue. TLC LefonconnemendunepuceTLCemendenquedunepuceMLC,acoubee compmée encoe pupoucéeunmaxmum déadfféenenconepaedeafabéeduneduéedeedepuenpu édue. LepuceTLC onpéenedanouessd écendenéedegammeeéusbdegande capacé.
6 HDDSSD LeockageuSSD Laboaoedeécupéaondedonnée Lefonconnemen Unefauedéeeenouen ockededonnée uunssd,ceockededonnéeuunemémoe doncçaneuejama. Concèemen,eunedonnéeuunepucemémoeneabîmepa.Eneanche,pouéceunedonnée(ouefface/amodfe)onôeuaaugmeneeoageàendodéépouchangeonéa.Ceeaugmenaonde oageaabîmepeàpeapucemémoe. Pouéedabîmeunepuceopapdemen,onôeumémohaque cycedécueéaéuepucemémoe. PenonexempedunSSDde128Goconenan8pucemémoe.CeSSD conenunyèmedexpoaonedephoo.lephoodaendepueu moeneonjamadépacée.leyèmedexpoaonquanàu,abeon defcheempoae,debaededonnée,defchequééchagepanene(cooke,hoque )LeSSDapaquemendemanèepemanene, modfedefche,eneffaceeencéedenoueaux. Lonôeuconnaéadeanédepucemémoe,aqueepuce1e 2conenaneyèmedexpoaonondaanageuéequeepuce3,4,5 e6quconennenephoo.poupoongeaduéedeedussd,adépace,demanèenbepouuaeu,eyèmedexpoaonue puce3e4eephooee1e2eandeueaeemp. An,epucemémoeueonàoudeôepouéeunaêde fonconnemenaoqueanepuceonencoeenbonneané.le phoo,mêmeuaeuneedépacepa,onauanendangequee ee.
7 HDDSSD LachuededqueHDD Inenéen1956,edquedueunaembagede pècemécanquepoé paune cae éonque. Lnefaceeneodnaeueedonnéeemaeà ceedunssd;onôeueappeécfmwaeee ocaé ua cae éonque ea uface de paeauxdudquedu. Unpaeaude dque duompoé de pueu couche : un aage daumnum, un aage de pane-cobaeunaagedephophoe-ncke.lode aconceponenaebanche,epaeauunénepa pafa.ceanezoneonopeneoupeufabe. Aandepouoaccuededonnée,uneéabe caogaphe éée pouépeoeduncôé e zoneuaeuedunaueezonenue.chaque paeauedoncdfféen.cenfomaononéce danefmwaedudqueduafndeuaouede zoneanedeue/écue. Su ce chéma apè poducon, e zone ouge op ene eon excuedufmwaedque. Ce fmwae joue un ôe a pou connae a ucue e oganaon dedonnée. An,daneugnedepoducon,epaeauxepu pefoman en ee een capacé,ejondon dauepaeauxmaeeeonaembédande dqueduhaudegammeedefoapacé;e paeaux pu en on e de gamme pu économqueeepudégadéeonuépou depupeapacé. IIeanpobe dobeedeux dque du cemendenque(mêmemaqueemodèe.)ma phyquemenèdfféen,una1paeaude1toe auea2paeauxde500gopaexempe. Ceeméhodedaembagepemeunefabepeede maèe ode a fabcaon dedqueduma augmeneadffcuépoueocéédeécupéaon dedonnéedeouedepècedenqueompabepouedquedupaen.
8 HDDSSD LachuededqueHDD 1956 Capacé:5Mo Moeu:1200pm Déb:8,8Ko/ 2018 Capacé:8To Moeu:7200pm Déb:150Mo/ La mnauaon de pèce mécanque a pem une éabeéducondeeuaeeuneaugmenaondea concenaon de donnée péene u e paeaux. Lefonconnemendebaeàquanàuèpeuchangé. Côéfonconnemen,oqueuaeuouhaeéceouaccédeàune donnée,ebocdeêedeue,poépaacaeéonqueeon neface(fmwae),odeazonedeockagepouaccédeàunendo pécuepaeaux.legnadeueoudécueeaoanm pae()de()(eboudeaêedeueaupupochedepaeaux).
9 HDDSSD Phoophe LeSSDpeu-aopéendeêeeempaçanduHDD? Non,nouneepenonpa. Cedeuxhnoogepoèdendeaou,depon fabeeneempenpaamêmemon. SSD HDD En foncon du beon de chacun ene aapdé,a écuéeoû,conendadhohabemenon méda. LahnoogedeSSDempoyéepouegandpubce enddepuenpuapdemadepuenpufabe adeeoudepannegandan. Lahnooge dehdd augmene encapacé een eebenpuenemen,eneanchonenudande bonnondon,eueemenndeucbe. LeSDDeunbonuppodeockage,fabeenueexcuemen. Ecededonnéeouenuppmee dégadeeeenddangeeuxdane emp.mêmoemeneneenu, afabéneeadedécoe. Sondébèapdeeapncpae foce.ieégaemen mmoe aux chocphyque,mapaéque. LeHDD quanàuemonapde queessd,eégaemenpufage eenbeauxbaon,aaonde empéaueeuou,auxchoc. Sceu-cebenaédanuneuné cenaeouuneeuaéé,auccu de enaon éguèemenneoyé, ceu-cne poède pade dae de défaance pogammée comme on homoogue.
10 HDDSSD Exempeduaon Laboaoedeécupéaondedonnée Pouockededonnéede fode,ceàde,defchemp3,defm oudemage;unssdpeuêeunebonnedée,danacondonqueu-c nepoèdepadeyèmedexpoaon. Danuneopque jeuxdéo oucenége,ueunssdpouyogeonyèmedexpoaoneunebonnedéepoueendepuapde.acondonqu nepaagepaonepaceadedonnéempoaneequeonuaeu oconcenqueonssde jeabe edeaêeempacéauboude3/4an. Pouunodnaeupoabe/abee ne conenanpade donnéucae (unquemenpouosedeappcaondemeageepaexempe)encoe unefoessdexceedanondomane. Pouuneuaondodnaeufamaconenanunyèmedexpoaonede donnée,ehddeaoommandé. Danuneopquedeockagedeéuademachne-ou,oudedonnée néceandêeaccebepapueupeonneenmêmeempedeaaedeu,ehddeégaemenpuécuan. Danuneeuouunebaedeockageedquedueégaemenemeeu choxenemedeécuéeongéé.
11 HDDSSD Conc u on LeSSD e c e ep u ap de, n on enpaf o c émenà ou e eapp c a on.con dé éc omme j e ab e e ao e me eua épouy ogeo e y èmed exp o a on.i e aen eanc he un é ab auc hema ou ogez un y ème d exp o a on+dedonnéeu a eu mpo an e. Dan ou eau a,ep nc pa emenpoudedonnée mpo an e,de e eu e u a onenen ep e, ehdd e a p u fiab e,c e u c ne po ède pa de da e de mo p og ammée c o emen oc ké,en ée o nde ouc hoc phy quepo b e. L e eb anc éd gépada al abcen e on é éc ha geab eg a u emendepu e e n e newww. da a abc en e. f.ce e peu enme e en a ande nf o ma on,de hno og eoud on e ba é u ex pé enc edememb edu abo a o e. T ou e ep oduc on n e d e an au o a on de au eu.t oud o é e é.u a on n e d ede mage, ex ee ogo, p o égé oucopy gh Da al abcen e
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