NCR RealPOS 40 - Page 111

Chapter 6: Solid State Drive Optimization 6-17
Re-Allocated Sector Count
Thisattributeshowsthenumberofretiredblockssinceleavingthefactory(also
knownasagrowndefectcount).
Power-On Hours Count
Thisattributereportsthecumulativenumberofpower‐onhoursoverthelifeofthe
device.UsetheRawvalueforthisattribute.
Note: TheOn/Offstatusofthedeviceinitiatedpowermanagement(DIPM)feature
willaffectthenumberofhoursreported.
 IfDIPMisturned“On”,therecordedvalueforpower‐onhoursdoesnotinclude
thetimeth
atthedeviceisina“slumber”state.
 IfDIPMisturned“Off”,therecordedvalueforpower‐onhoursshouldmatchthe
clocktime,asallthreedevicestatesarecounted:active,idleandslumber. 
C – Power Cycle Count
Thisattributereportsthecumulativenumberofpowercycleevents(poweron/off
cycles)overthelifeofthedevice.UsetheRawvalueforthisattribute.
C0 – Unsafe Shutdown Count
Thisattributereportsthecumulativenumberofunsafe(unclean)shutdownevents
overthelifeofthedevice.Anunsafeshutdownoccurswheneverthedeviceis
poweredoffwithoutSTANDBYIMMEDIATEbeingthelastcommand.UsetheRaw
valueforthisattribute.
E1 – Host Writes
Thisattributereportsthetotalnumberofsectorswrittenbythehostsystem.Theraw
valueisincreasedby1forevery65,536sectorswrittenbythehost.UsetheRawvalue
forthisattribute.
E8 – Available Reserved Space
Thisattributereportsthenumberofreserveblocksremaining.Theattributevalue
beginsat100(64h),whichindicatesthatthereservedspaceis100percentavailable.
Thethresholdvalueforthisattributeis10percentavailability,whichindicatesthat
thedriveisclosetoitsendoflife.UsetheNormalizedvalueforthisattribute.
E9 – Media Wear Out Indicator
ThisattributereportsthenumberofcyclestheNANDmediahasexperienced.The
normalizedvaluedeclineslinearlyfrom100to1astheaverageerasecyclecount
increasesfrom0tothemaximumratedcycles.