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1、pc机系统启动过程Onthedualsystemmenu,NTsystemstartup1,[prelaunchstage:.>1,theprocessofpost-bootself-checking:thisisthepoweroneachcomputer,mustbethefirstthingtodo.Thepostwillcheckhardware,whetherthereisamemory,ifthereisakeyboardandSCSIcardandsoon.Althoughthisisanuclearprocessthatisindependentoftheo
2、peratingsystem,butheisguaranteesystemnormalstartthefirststep・2>,oncetheself-checkiscompleted,thecomputationisabouttofindthebootdevice,andthembr-mainbootrecord(themainbootrecord)istransferredintomemory.Typicalfailure:thebluescreenafterboot,z，operatingsystemnotfounprompted"invalidpartitionta
3、ble"TheseerrormessagesoccurbecausetheMbrisdestroyed:Solution:startthecomputerwiththesystembootdisk(floppydiskorcd-rom)andexecutethefollowingcommand:Fdisk.Exe/MBRFdiskMBR/thiscommandonaharddiskmainbootprogramandthepartitiontable,unconditionallyandnottheDOSbootsector一Dbr一DOSbootrecord,fileal
4、locationtableanddirectoryareaisinitialized;Inotherwords,whenyouexecutefdisk/MBR,youcanrebuildthemasterbootprogramandthepartitiontablewithoutdestroyingthedatainformationontheharddrive・Hecanremovethevirusfromtheharddrivethatinfectsthevirusinanembeddedchannel.Fdiskisthestandardcommandinms-dos
5、,Windows95/98/me,andWindowsNT/2k/XPuserscanfixthemainbootrecordinthefollowingway:Startthesystemfailoverconsole,enterfixmbrunderthecommandprompt,presstheYkeywhenthewarningmessageappears,andthenenterexitexitfailureresponseconsole・2>,whichcomputestheupcomingactivitypartition,guidesthesector,a
6、ndloadsitintomemory.3>,whichstartstocallNtldr,Ntldristhesystemloader,whichisacriticalpartofthesecondphase;Plus:theMbr,orthemasterbootrecord,inChinesemeansthemasterbootrecord,0trackthefirstsectoroftheharddrivecalledMbr,hissizeis512bytes,andthisareacanbedividedintotwoparts:I,thepre-thebootar
7、ea(prelauncharea),accountingfor446-byte:ii,thesecondpartisapartitiontablearea(thepartitiontable)of64bytes,theequivalentofasmallprogram,theeffectismarkedasactivepartitionisthepartition,andthentoreadthepartitionofthestartzone,andrunthecodeinthatarea・Thelasttwoby
