FAT文件系统原理的详细分析-数据恢复

EnglishRAIDFAT(1)“”(platter)N2N2N(Heads)012()R(Cylinders)012……(Sector)512byte123……Cylinders×Heads×Sector3.1MBR(masterbootrecord)powerbiosbiosBiosmbrMBR(masterbootrecord),001()biosjumpmbrmbr512byteMBR446(0H~1BDH)64(1BEH~1FDH)DPT(DiskPartitionTable)“55AA”(1FEH~1FFH)MBRMBRMBRmbrwinhex120GBmbrMBRwowocockmbrDPTCZDPT64?microsoftDPT641611winhex160334310H00H80H80H00Hmicrosoft2()1(littleendianformat)0x3F0000000x0000003F6337000M6997M2H6H,6(bit)10(bit)6H6107H81080,1,1024×63×256×512byte=8455716864byte8.4GB(7.8GB)255(),38.4GBC/H/SCHFH43242^322TB=2048GB8.4GBC/H/S()8.4GBC/H/SFEHFFHFFHC/H/S1024(MBRMBR43.2MBR(ExtendedBootRecord,EBR)[e-mail]()fat12fat16fat327fat16fat32DBRFAT1FAT24.1DBR.DBR(DOSBOOTRECORD)0512(0)512BPB(BIOSParameterBlock)BPBosFAT32DBR8839winhex8DBRDBRMBRCPUx86CPU(BPBBPB)8OEMIDOEMIDMS-DOSWindows2000FAT16FAT32“MSDOS5.0”NTFS(ntfs)Windows2000“NTFS”Windows95OEMID“MSWIN4.0”Windows95OSR2Windows98OEMID“MSWIN4.1”0x0BBPB(BIOSParameterBlock)BPBBPBx86BPBBPBBPB98FAT32BPBBPB45DBR0x5A0x0080x00~0x02EB5890OSjump58H0x5Awin98,fatwin2000,winxpDBR0fat32320FAT32win98,02osFAT32win2000winxp,00xC(win2000winxp,0xC00xAB)osfat32DBR2(win98)0xC(win2000winxp)NTLDRDBR0x55AADBRDBRos0x55AAFAT16DBRFAT32DBRFAT12FAT16FATFAT12FAT16FAT16FAT324.2FATDBR0x0E2()DBRDBRFAT161DBRFAT3232PartitionMagicFAT323663FAT320DBR2(win98)0xC(win2000,winxp)OSFAT32DBRFAT32DBR0x342DBR0x066FAT32DBR604.3FATFAT(FileAllocationTable)MicrosoftFAT()FATFATFATFATFATFAT100KB100KB1001KBA.TXT(10KB),B.TXT(53.6KB)C.TXT(20.5KB)100KB31K()1KBA.TXT10(“”)B.TXT54C.TXT21B.TXTC.TXT14.3.1B.TXT54KB1KB100100B4.3.2A.TXTB.TXTA.TXTB.txtb.txt4.3.34.3.4D.txt(60.3KB),1003168611Kb34.3.54.3.64.3.74.3.74.3.84.3.8a.txta.txt2233344......11FFb.txt60.3KBd.txt4.3.94.3.104.3.11fat()FAT16:fatfat7FAT16FAT16MicrosoftFAT164.3.126(5)(DBR),FAT16DBRFATFATFAT16FAT5122n(n)512B,1K,2K,4K,8K,16K,32K64K32K512bfat9326808format12FAT16MB12FATFAT12FATFAT12FAT16FAT32FAT125.251.44MB3.5FAT12FATFAT16FAT16FAT16FATFATDBRFAT16DBR0x110x16FAT0x10FATFAT163201()212FAT121632FATFAT16FAT2(16)FAT160xFFFF(65535)32KFAT3232KB×65535=2048MB,FAT162GBFAT2FAT12(4)FAT10winhexFAT1610FATF8FFFFFF2FATFAT20x4~0x52(1)FF,2()130x000555?D?DFATFAT5FFFF,40x000666?D?DFATFAT60x00077?D?DFATFAT7……FAT0x1A~0x1B130x000E14?D?D14FFFFFATFATMicrosoftFATFATFAT2FAT2FAT1FAT1FAT2FATFAT()FAT()FATDBRDBRFAT(2)FAT2322FAT()FAT32(NTFS)FAT16()FAT()()03232()321111(1)+0x0~0x70x8~0xAASCII.8(20H)3(20H)0x000HE5H()“.”“..”“.”“..”(doswindows)(2)0xB0xB8800000101(3)0xC~0x15FAT16WINDOWSFAT32FAT32(4)0x16~0x17=*2048+*32+/2160x160~420x165~70x170~20x173~7(5)0x18~0x19=(-1980)*512+*32+160x180~40x185~70x1900x191~70~1191980~2099Windows0~1272107(6)0x1A~0x1BFAT0x1C~0x1F()(7)()0xB410FAT99FAT21DBRFAT16WindowsFAT16FAT16FAT32FAT32FAT32FAT32MicrosoftNTFSFAT32MicrosoftWindowsFAT32FAT16FAT32FAT32FAT164.3.13FAT32FAT32DBRBPB45FAT3232FAT16DBRDBRFAT32win98win2000winXPOSBPBDBRDBRFAT32FAT16FAT3232FAT3232FAT2T11TBFAT32FAT32GBFAT32WIN2000OS32GBFAT32WIN98127GBFAT32FAT32FAT3265527FAT16FAT12FAT3212FAT32FAT1613FAT32FAT16512()14.3.12FAT32FAT1612(FAT16FAT16321)FAT32FAT16FAT16FAT1614(1)FAT32FAT16(2)FAT3232()32FAT320x12~0x1316(3)4FAT324GB()4GB(),FAT32OSOSOS(1)6~1(2)~5(3)~5~1()(4)OS_0xB0FHDOSWIN320xB0FWindows9xWindows2000XP25513unicode()21515(E5H)0xD11c11shortname[],chknumintij,chknum=0;for(i=11;i0;i--)chksum=((chksum&1)?0x80:0)+(chksum1)+shortname[j++];0xDFAT32©2003-2004:0086-0595-22841608013305960800E-mail:cailujin163.com