Undelete file & Recover Partition
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Undelete file & Recover Partition |
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Partition Boot SectorTable 5-1 describes the boot sector of a volume formatted with NTFS. When you format an NTFS volume, the format program allocates the first 16 sectors for the boot sector and the bootstrap code. Table 5-1 NTFS Boot Sector
On NTFS volumes, the data fields that follow the BPB form an extended BPB. The data in these fields enables Ntldr (NT loader program) to find the master file table (MFT) during startup. On NTFS volumes, the MFT is not located in a predefined sector, as on FAT16 and FAT32 volumes. For this reason, the MFT can be moved if there is a bad sector in its normal location. However, if the data is corrupted, the MFT cannot be located, and Windows NT/2000 assumes that the volume has not been formatted. The following example illustrates the boot sector of an NTFS volume formatted while running Windows 2000. The printout is formatted in three sections:
Physical Sector:Cyl 0, Side 1, Sector 1
00000000:EB 52 90 4E 54 46 53 20 -20 20 20 00 02 08 00 00 .R.NTFS ........
00000010:00 00 00 00 00 F8 00 00 -3F 00 FF 00 3F 00 00 00 ........?...?...
00000020:00 00 00 00 80 00 80 00 -4A F5 7F 00 00 00 00 00 ........J.......
00000030:04 00 00 00 00 00 00 00 -54 FF 07 00 00 00 00 00 ........T.......
00000040:F6 00 00 00 01 00 00 00 -14 A5 1B 74 C9 1B 74 1C ...........t..t.
00000050:00 00 00 00 FA 33 C0 8E -D0 BC 00 7C FB B8 C0 07 .....3.....|....
00000060:8E D8 E8 16 00 B8 00 0D -8E C0 33 DB C6 06 0E 00 ..........3.....
00000070:10 E8 53 00 68 00 0D 68 -6A 02 CB 8A 16 24 00 B4 ..S.h..hj....$..
00000080:08 CD 13 73 05 B9 FF FF -8A F1 66 0F B6 C6 40 66 ...s......f...@f
00000090:0F B6 D1 80 E2 3F F7 E2 -86 CD C0 ED 06 41 66 0F .....?.......Af.
000000A0:B7 C9 66 F7 E1 66 A3 20 -00 C3 B4 41 BB AA 55 8A ..f..f....A..U.
000000B0:16 24 00 CD 13 72 0F 81 -FB 55 AA 75 09 F6 C1 01 .$...r...U.u....
000000C0:74 04 FE 06 14 00 C3 66 -60 1E 06 66 A1 10 00 66 t......f`..f...f
000000D0:03 06 1C 00 66 3B 06 20 -00 0F 82 3A 00 1E 66 6A ....f;....:..fj
000000E0:00 66 50 06 53 66 68 10 -00 01 00 80 3E 14 00 00 .fP.Sfh.....>...
000000F0:0F 85 0C 00 E8 B3 FF 80 -3E 14 00 00 0F 84 61 00 ........>.....a.
00000100:B4 42 8A 16 24 00 16 1F -8B F4 CD 13 66 58 5B 07 .B..$......fX [..
00000110:66 58 66 58 1F EB 2D 66 -33 D2 66 0F B7 0E 18 00 fXfX.-f3.f......
00000120:66 F7 F1 FE C2 8A CA 66 -8B D0 66 C1 EA 10 F7 36 f......f..f....6
00000130:1A 00 86 D6 8A 16 24 00 -8A E8 C0 E4 06 0A CC B8 ......$.........
00000140:01 02 CD 13 0F 82 19 00 -8C C0 05 20 00 8E C0 66 ..............f
00000150:FF 06 10 00 FF 0E 0E 00 -0F 85 6F FF 07 1F 66 61 ..........o...fa
00000160:C3 A0 F8 01 E8 09 00 A0 -FB 01 E8 03 00 FB EB FE ................
00000170:B4 01 8B F0 AC 3C 00 74 -09 B4 0E BB 07 00 CD 10 .....<.t........
00000180:EB F2 C3 0D 0A 41 20 64 -69 73 6B 20 72 65 61 64 .....A disk read
00000190:20 65 72 72 6F 72 20 6F -63 63 75 72 72 65 64 00 error occurred.
000001A0:0D 0A 4E 54 4C 44 52 20 -69 73 20 6D 69 73 73 69 ..NTLDR is missi
000001B0:6E 67 00 0D 0A 4E 54 4C -44 52 20 69 73 20 63 6F ng...NTLDR is co
000001C0:6D 70 72 65 73 73 65 64 -00 0D 0A 50 72 65 73 73 mpressed...Press
000001D0:20 43 74 72 6C 2B 41 6C -74 2B 44 65 6C 20 74 6F Ctrl+Alt+Del to
000001E0:20 72 65 73 74 61 72 74 -0D 0A 00 00 00 00 00 00 restart........
000001F0:00 00 00 00 00 00 00 00 -83 A0 B3 C9 00 00 55 AA ..............U.
The following table describes the fields in the BPB and the extended BPB on NTFS volumes. The fields starting at 0x0B, 0x0D, 0x15, 0x18, 0x1A, and 0x1C match those on FAT16 and FAT32 volumes. The sample values correspond to the data in this example.
Protecting the Boot SectorBecause a normally functioning system relies on the boot sector to access a volume, it is highly recommended that you run disk scanning tools such as Chkdsk regularly, as well as back up all of your data files to protect against data loss if you lose access to a volume.
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