ASROCK H77 Pro4-M - Introduction to ASRock H77 Pro4-M Motherboard; Package Contents

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2.2 RAID Congurations Precautions
1. PleaseusetwonewdrivesifyouarecreatingaRAID
0(striping)arrayforperformance.Itisrecommended
tousetwoSATAdrivesofthesamesize.Ifyouuse
twodrivesofdifferentsizes,thesmallercapacityhard
diskwillbethebasestoragesizeforeachdrive.For
example,ifoneharddiskhasan80GBstoragecapa-
cityandtheotherharddiskhas60GB,themaximum
storagecapacityforthe80GB-drivebecomes60GB,
andthetotalstoragecapacityforthisRAID0setis
120GB.
2. Youmayusetwonewdrives,oruseanexistingdrive
andanewdrivetocreateaRAID1(mirroring)array
fordataprotection(thenewdrivemustbeofthe
samesizeorlargerthantheexistingdrive).Ifyou
usetwodrivesofdifferentsizes,thesmallercapacity
harddiskwillbethebasestoragesize.Forexample,
ifoneharddiskhasan80GBstoragecapacityand
theotherharddiskhas60GB,themaximumstorage
capacityfortheRAID1setis60GB.
3. Pleaseverifythestatusofyourharddisksbeforeyou
setupyournewRAIDarray.
WARNING!!
  PleasebackupyourdatarstbeforeyoucreateRAIDfunctions.
  IntheprocessyoucreateRAID,thesystemwillaskifyouwant
  to“ClearDiskData”ornot.Itisrecommendedtoselect“Yes”,
  andthenyourfuturedatabuildingwilloperateunderaclean
  environment.