Delta Embedded DVR Manuel d'utilisateur télécharger pdf (Page 78)

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  200WriteErrorCount

Note:Differentmanufacturersanddifferentmodelshavedifferentattributedescription,userhas

noneedtoknowexactmeaning,attributedetectionvaluesenoughforthem.

3Threshold

Itisspecifiedbymanufacturercalculatedthroughaspecificformula.Ifthereisaattributevalue 

lowerthanthethreshold,whichmeansHDDbecomeunreliableanddatastoredisveryeasytolose.

CompositionandsizeofreliableattributevaluesisdifferentfordifferentHDD.Itshouldbenotedthat,

ATAstandardonlyprovidessomeSMARTparameters;itdoesnotprovideaspecificvalue."Threshold"

valueisdeterminedbymanufacturersbasedonproducts’features.Thus,resultstestedby

manufacturerprovideddetectionsoftwareisverydifferentfromtestingsoftwareunderWindows

(suchasAIDA32)

4AttributeValue

Attributevalueisthemaximumnormalvalue;thegeneralrangeisfrom1to253.Typically,the

maximumattributevalueis100(forIBM,Quantum,andFujitsu)or253(forSamsung).Ofcourse,

therearesomeexceptions,forexample,somemodelsproducedbyWesternDigitalhavetwodifferent

attributevalues,andpropertyvalueisset200wheninitialproduction,butafterthenitischangedinto

100.

5Worst

Worstvalueisthelargestnon‐normalvalueinHDD’srunning.ItisavaluecalculateforHDD’s

cumulativerunning,itisconstantlyrefreshedaccordingtorunningcycle,andveryclosedtothe

threshold.WhethertheHDDisnormalbyS.M.A.R.Tanalysisisbasedonthecomparisonwith

threshold.ThemaximumvalueappearwhennewHDDstarttouse,whichwouldcontinuetodecrease

withtheeverydayuseorerrorhappen.Consequently,largerattributevaluesmeanbetterqualityand

higherreliability;smallervaluesmeanmorepossibilityoffailureincreases.

6Dates

ActualvaluesofHDD’sdetectionitems,manyitemsarecumulativevalues.

7Status

ItiscurrentstatuesofHDD’severyattributeafteranalyzingandcomparingaboveattributevaluesby

S.M.A.R.T,alsoisimportantinformationtojudgeHDDhealthyornot.

Therearethreestatuses:Normal,AlarmandError‐‐‐‐whichiscloselyrelatedwith

Pre‐failure/advisoryBIT.

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Delta Embedded DVR Manuel d'utilisateur Page 78