NAD M52 User manual

NAD
SERVICE MANUAL
M 52
M 52
Digital Music Vault
Digital Music Vault

NAD M50 Digital
Music Player
NAD M52 Digital Music Vault
®
M52 Digital Music Vault
Quick Setup Guide
WHAT’S IN THE BOX
CONNECT!
POWER UP!
IMPORTANT!
• The NAD M50 that appears in this guide is a reference model only and not included in the NAD M52 package.
• The NAD M52 is compatible only with the NADM50.
• The NAD M52 cannot be connected directly to a PC or MAC.
• Check out the NAD website, http://nadelectronics.com/products/masters-series/M52-Digital-Music-Vault, for further information about the NAD M52.

©2013 NAD ELECTRONICS INTERNATIONAL, A DIVISION OF LENBROOK INDUSTRIES LIMITED
All rights reserved. NAD and the NAD logo are trademarks of NAD Electronics International, a division of Lenbrook Industries Limited.
M52_QS_v04 - Jan 2013
NAD M50 Digital Music Player

M52ReferencesforServiceManual(Rev.A)

M52LEDIndication
standby:powerLEDamber,HDDLEDsoff
powerup:powerLEDsteadyblue,HDDLEDsinterleavingflashingred/blue
short‐timepowerloss(e.g.USBunplugandplugbackinasecondortwo):PowerLEDsteadyblue,HDD
LEDsflashingred/blueatthesametime
unitactivehealthily:allLEDssteadyblueandtheunitcanbeaccessedandrecognized
unithasinvalidRAIDset:allLEDssteadybluebuttheunitcan'tbeaccessedornotrecognized.
rebuilding:LEDoftherebuildingHDDflashingblue
rebuildsuccess:LEDoftherebuildingHDDsteadyblue
rebuildfailure:LEDoftherebuildingHDDflashingred
individualdiskhealthy:LEDoftheHDDsteadyblue
diskfailure:LEDoftheHDDflashingred
diskmissing:LEDoftheHDDsteadyred

NOTE:
1) “unithasinvalidRAIDset”maybecausedbyinsertingaHDDthatwaspartofotherRAIDset
unit.WipingthelastfewsectorsoftheHDDwillsolvetheproblem(see“Rebuild”note1).Orif
it’scausedbysomethingelse,re‐initializeandreconfiguretheRAIDsetisrequiredwhichwill
causethedataloss.

2) “diskfailure”maybecausedbySATAportfailureifthediskitselfishealthy.Replacingthefailed
diskwithanewoneorunplugandplugbackthefaileddisk,andrebuildRAIDarraywillsolvethe
problem(seehowtorebuildRAIDarraysection).





Initialize/ConfiguretheRAIDArray
1) WhenisRAIDarrayinitializationneeded
WhentheRAIDarrayisinvalidorwhentwoormoreoftheHDDsarereplaced,re‐initializationofthe
RAIDarrayisrequired.Buttheinitializationwilldestroyalldatapreviouslystoredonthedisksandis
completelyirreversible!

2) HowtoinitializeandconfigureRAIDarray
Makesurealltheharddisksarehealthy.
•Powerontheunit
•Press"reset"buttonattherearpanelsoonaftertheharddiskLEDsstartstoflash
•Press"reset"buttonagainaftertheLEDsflash20timesaftertheabovestep.Afterthisstep,all
theHDDLEDsbecomesteadyblue.Atthispoint,allthedataintheharddisksarelostandthe
unithastobeformatted.
•Partitionandformattheunit




Rebuild
1) WhenisRAIDarrayrebuildneeded
Ifoneandonlyoneoftheharddisksiseithermissingorfails,i.e.thatharddisk'sLEDbecomessteady
redorflashingred,theunitRAIDarrayneedsrebuild.
Iftwoormorethantwoharddisksfail,RAIDarraycan'tberebuiltandthedataintheunitwillbelost.
Atthispoint,tocontinueusetheunit,youwillhavetoreplaceallthebroken/failedharddisksandre‐
initializetheRAIDarray.

2) HowtorebuildaRAIDarraywithsamehealthyHDDintheunit
ThiscasehappenswhenonehealthyHDDisremovedandthenputbackatthesameposition.
•Powerdowntheunit
•UnplugonehealthyHDD
•Poweruptheunituntilit’ssteady(2HDDsLEDblue,unpluggedHDDLEDred)–thisstepleaves
theunitindegradedmode
•Powerdowntheunit
•PlugtheHDDback
•Poweruptheunit–thisstepwillrebuildtheRAIDarrayoftheunit

3) HowtorebuildaRAIDarraywithanewhealthyHDD
ThiscasehappenswhenoneHDDisreplacedwithanewhealthyHDD.
•Powerdowntheunit
•Removethefailed/brokenharddisk
•Replaceitwithanewhealthyharddisk
•Powerbackontheunit.Pressthetiny"reset"buttonattherearpanelafterHDDLEDsflashes22
times.ThiswillstarttheRAIDarrayrebuild.Duringrebuild,thenewHDDLEDwillbeflashing
blueandtherestLEDsaresteadyblue.




NOTE:
1) “newhealthyharddisk”
ItmustbeatleastthesizeofthesmallestdiskusedwhenthesetofRAIDdiskswascreated.Diskwith
identicalcapacityastheothertwoisrecommended,withthebestoptionofmatchingthesamemodel
numberoftheothertwodisks.
Itcouldbeabrandnewharddiskboughtfromstoreorusedoneaslongasitishealthy,couldbeeither
formattedorunformatted,couldhaveexistingdataorempty,butitmustNEVERbeusedbyotherRAID
devicebefore.IftheHDDisusedbyotherRAIDdevicebefore,makesuretoWIPEthelastfewsectors
oftheHDDwheretheRAIDinformationisstored.
****** example to wipe the last 2MB or less of a 1TB HDD that is connected to Ubuntu Linux ******
remi@ubuntu:~$ sudo dd if=/dev/zero of=/dev/sdb bs=1024 count=2048 seek=976761000
dd: writing `/dev/sdb': No space left on device (this warning is ok)
1585+0 records in
1584+0 records out
1622016 bytes (1.6 MB) copied, 1.43649 s, 1.1 MB/s

2) “rebuildtime”
Therebuildtimetakesapproximately4hoursforthree1TBSATAIIdisk(e.g.SeagatePipelineHD2)and
2.5hoursforthree1TBSATAIIIdisk(e.g.SeagatePipelineHD).Therebuildtimevariesdependingonthe
SATAdiskcapacity.
3) “dataintegrityduringrebuild”
Duringtherebuildprocess,thedataintheunitstaysasis,andyoumaycontinueusetheunit.
4) “interruptduringrebuild”
OnlypoweringoffofM52caninterrupttherebuild.UnpluggingUSBcablewon'tstoptherebuild.We
recommendnotturningthepoweroffduringtherebuildprocess.Butifitisinterrupteditwillcontinue
rebuildingthedataassoonasthepowerisrestored.

FAQ:
1) Whatisdegradedmode?
M52worksindegradedmodewhenoneandonlyoneofthehealthyRAIDarraysetofdisksisremoved.
Whileindegradedmode,theunitcontinuestooperatewithoutlossofdata,storagecapacity,or
performance.However,theunitisnolongersecureandwillsufferdatalossifoneormorediskfails.
2) OneoftheHDDLEDflashesbluefor1or2minuteafterpowerup.Whatisitdoingandwhy?
Theshort‐timeLEDflashmeansthecorrespondingHDDisrebuilding.It'sbecausethepreviouspoweroff
happensbeforediskscommittheircachestodisk,whichcausesthedataorparityinconsistencyonthe
disk.Theshort‐timerebuilduponpowerupwillcorrecttheinconsistency.
3) CanIswapanyoftheHDDsintheunitorbetweenunits?
No.EachdiskhasauniqueglobalIDwhichensuresthatdiskscannotbeswappedbetweensets–
althoughsetswithswappeddisksmightbehavecorrectly,thedataisuselessbecauseitismixedup.
4) Whydoesittakesolongtopoweruptheunit?
Thesystemswitchesonthedisksindependentlyandwithsufficientdelaybetweendiskstominimize
peakpowerconsumptionduringmotorspin‐up.
5) CanotherHDDbrandsbeenused(e.g.WDred)?
M52allowstheSATAdiskdrivestobeofdifferentbrandsandsizes.ThecapacityofasetofRAIDdisksis
twiceofthesmallestdisksize,leavingtheupperpartofanylargerdiskunused.However,HDDsof
identicalcapacitiesandsamemodelsarerecommended.Incaseyoucan’tgetidenticalHDDsforaRAID
set,beawarethat:
¾ThesmallestHDDdisksizecan’tbegreaterthan1TBduetoconfiguration
¾WhenM52alreadyworksindegradedmode,anewHDDpluggedintothearrayforrebuildmust
beatleastthesizeofthesmallestdiskusedwhenthesetofRAIDdiskswascreated
¾HDDdiskvoltagetolerancecan’tbegreaterthan5%for+5vand10%for+12v
¾IfHDDdisksarenotSATAIIorSATAIIItype,thedatatransmissionspeedwillbedecreasedand
therebuildtimewillbelonger

6) IfthecontrollerboardisreplacedbuttheexistingthreeHDDsarekeptusing,whatwillhappen?
Ifthecontrollerboardisconfiguredsameastheonebeforereplaced,i.e.sameRAIDmode,disknumber,
andflashtype/speedetc.,andtheexistingthreeHDDsarekeptsameposition,theRAIDsetofdisks
shouldworkjustfineastheserialnumbersoftheHDDsallmatchandtheyareautomaticallytreatedas
acompleteset.

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REF.N0 PartNo. Description Qty.
188-212002-0A ShippingBox 1
288-212001-0A GiftBox 1
389-211001-0 EPEBottom 1
4 00-65200-00 M52Unit 1
587-211001-0 Non-wovenClothBag 1
690-001001-0 Poly-bag 1
789-211002-0 EPETop 1
888-043003-0 M15AccessoriesBox 1
930-46521-00 QuickStartGuide 1
10 88-043004-0 M15BoxSheet 1
11 A15-16250-07 ACCord 1
A15-13125-00 ACCord(AH) 1
12 29-65201-00 USBCable 1

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F001
F002
F003
F004
F006
T001
R001
R002
R003
C001
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C005
C006
C010
C011
C004
T002
F005
S001
S002
S003
S003
S004
S005
S007
S006
S008
S009
S010
S011
S012
C007
C012
S004
C009
C008
C009
T002