CHS-Translation.pdf

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1、HowItWorks--CHSTranslationPlusBIOSTypes,LBAandOtherGoodStuffVersion4abyHaleLandis(landis@sugs.tware.com)THE"HOWITWORKS"SERIESThisisoneofseveralHowItWorksdocuments.Theseriescurrentlyincludesthefollowing:*HowItWorks--CHSTranslation*HowItWorks--MasterBootRecord*How

2、ItWorks--DOSFloppyBootSector*HowItWorks--OS2BootSector*HowItWorks--PartitionTablesIntroduction(READTHIS!)-------------------------Thisisverytechnical.Pleasereadcarefully.Thereislotsofinformationherethatcansoundconfusingthefirsttimeyoureadit.Whyisanunderstandingo

3、fhowaBIOSworkssoimportant?ThebasicreasonisthattheinformationreturnedbyINT13HAH=08HisusedbyFDISK,itisusedinthepartitiontableentrieswithinapartitionrecord(liketheMasterBootRecord)thatarecreatedbyFDISK,anditisusedbythesmallbootprogramthatFDISKplacesintotheMasterBoo

4、tRecord.TheinformationreturnedbyINT13HAH=08Hisincylinder/head/sector(CHS)format--itisnotinLBAformat.Thebootprocessingdonebyyourcomputer'sBIOS(INT19HandINT13H)isallCHSbased.Readthissothatyouarenotconfusedbyallthefalseinformationgoingaroundthatsays"LBAsolvesthe>52

5、8MBproblem".ReadthissothatyouunderstandthepossibledataintegrityproblemthataWDEIDEtypeBIOScreates.AnyBIOSthathasa"LBAmode"intheBIOSsetupcouldbeaWDEIDEBIOS.BeverycarefulandNEVERchagethe"LBAmode"settingafteryouhavepartitionedandinstalledyoursoftware.History-------C

6、hangesbetweenthisversionandthepreceedingversionaremarkedby"!"atleftmarginofthefirstlineofachangedornewparagraph.Version4--BIOSTypes8and10updated.Version3--NewBIOStypesfoundandaddedtothislist.MoredetailedinformationislistedforeachBIOStype.AsectiondescribingCHStra

7、nslationwasadded.Version2--Arewriteofversion1addingBIOStypesnotincludedinversion1.Version1--FirstattempttoclassifytheBIOStypesanddescribewhateachdoesordoesnotdo.Definitions-----------*528MB-Themaximundrivecapacitythatissupportedby1024cylinders,16headsand63sector

8、s(1024x16x63x512).ThisisthelimitforCHSaddressingintheoriginalIBMPC/XTandIBMPC/ATINT13HBIOS.*8GB-Themaximumdrivecapacitythatcanbesupportedby1024cylinders,256headsand63