Delta Embedded DVR User Manual Page 78

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
77/85
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AttributeValue
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.
5Worst
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.
6Dates
ActualvaluesofHDD’sdetectionitems,manyitemsarecumulativevalues.
7Status
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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