Data Recovery Examples
From CGSecurity
You can see some complexe examples of data recovery with TestDisk.
Contents |
The type of the file system is RAW - Recovery of a damaged FAT boot sector
Analyse Disk 80 - CHS 3737 255 63 - 29313 MB (Enh BIOS mode) 1 * FAT32 0 1 1 382 254 63 6152832 [LOKAL DISK] 2 E extended LBA 383 0 1 3736 254 63 53882010 Partition sector doesn't have the endmark 0xAA55 5 L FAT32 383 1 1 3736 254 63 53881947 5 L FAT32 383 1 1 3736 254 63 53881947
The boot sector of the logical FAT32 partition is damaged.
(Windows error message is usually The type of the file system is RAW.
or The disk in drive D is not formatted. Do you want to format it now ?)
In Advanced, select this partition:
Interface Advanced 1 * FAT32 0 1 1 382 254 63 6152832 [LOKAL DISK] 2 E extended LBA 383 0 1 3736 254 63 53882010
5 L FAT32 383 1 1 3736 254 63 53881947 Boot sector test_FAT : Partition sector doesn't have the endmark 0xAA55 Backup boot sector OK First sectors (Boot code and partition information) are not identical. Second sectors (cluster information) are not identical. Third sectors (Second part of boot code) are not identical.
The backup boot sector is valid, choose Backup BS to
copy backup boot sector over boot sector. If Backup BS isn't available,
choose RebuildBS.
Recovery of a lost and damaged NTFS
Analyse Disk 81 - CHS 2434 255 63 - 19092 MB (Enh BIOS mode) No partition is bootable
No partition is available.
Analyse Disk 81 - CHS 2434 255 63 - 19092 MB (Enh BIOS mode) L FAT32 1275 1 1 2433 254 63 18619272 [NO NAME]
Only the second NTFS partition is found. Select Search! to try to find more partitions.
Analyse Disk 81 - CHS 2434 255 63 - 19092 MB (Enh BIOS mode) * HPFS - NTFS 0 1 1 1274 254 63 20482812 L FAT32 1275 1 1 2433 254 63 18619272 [NO NAME]
Both partitions have been found, but the first NTFS has been found using backup boot sector,
we need to restore the boot sector. Choose Write and next choose Backup BS to
copy backup boot sector over boot sector.
Recovery of a Dell computer
On Dell computer, there is a special partition called DellUtility. It's a FAT16 partition that is not visible from Windows because its partition type is DE.
Disk 80 - CHS 4865 255 63 - 38162 MB (Enh BIOS mode) * FAT16 >32M 0 1 1 3 254 63 64197 [DellUtility] P HPFS - NTFS 4 0 1 4864 254 63 78091965
After Analyse, select the DellUtility partition, use 'T' to change the partition type to DE. Use the arrow key to boot on the NTFS partition.
Disk 80 - CHS 4865 255 63 - 38162 MB (Enh BIOS mode) P Dell Utility 0 1 1 3 254 63 64197 [DellUtility] * HPFS - NTFS 4 0 1 4864 254 63 78091965
Problem of disk geometry - When all partitions are deleted
In this case, all partitions have been deleted. TestDisk show no partition! The user has run testdisk /debug /log. Extract of testdisk.log
Analyse Disk /dev/hdb - CHS 5169 240 63 - 38161 MB No partition is bootable search_part() Disk /dev/hdb - CHS 5169 240 63 - 38161 MB FAT32 at 0/1/1 heads/cylinder 255 (FAT) != 240 (HD)
A FAT32 partition has been found but there is a warning about harddisk geometry. The BIOS has selected another harddisk geometry because of the content of the MBR (empty in this case). Under TestDisk, choose geometry, set the number of heads to 255 instead of 240 and run again Analyse.
Two FAT32 partitions to recover
There were two FAT32 on the harddisk but they have been deleted. After running Analyze and Search!, TestDisk has found only the second one
Disk 81 - CHS 525 255 63 - 4118 MB L FAT32 384 1 1 524 254 63 2265102
Using A to add what we think is the missing partition, a new partition table have been written with two FAT32:
1 P FAT32 0 1 1 383 254 63 6168897 2 E extended 384 0 1 524 254 63 2265165 5 L FAT32 384 1 1 524 254 63 2265102
Using Advanced, Boot, RebuildBS, we have try to rebuild the boot sector of the first FAT32. Using List, it is possible to see a listing of files from the root directory but there is also a lot of garbage... Nothing has been written. In the log file (Expert mode can give this information), we can see that 4 copies of FAT32 have been found:
FAT32 at 32(0/1/33), nbr=123 FAT32 at 8221(0/131/32), nbr=123 FAT32 at 16097(1/1/33), nbr=1234 FAT32 at 22100(1/96/51), nbr=1234
Normally only two copies of FAT should be found. There are remaining data from two different FAT32 partitions: one beginning at 0/1/1, the second at 1/1/1. We have done a mistake. This time, we add the correct partition and choose to Write
1 E extended 1 0 1 524 254 63 8418060 5 L FAT32 1 1 1 383 254 63 6152832 6 L FAT32 384 1 1 524 254 63 2265102
With RebuildBS (Advanced/Boot), we have been able to successfully rebuild the boot sector.
Lost partition after defrag
After running defrag against the first partition, the second FAT32 drive vanishes. When checking the partition table, TestDisk detects a problem with the first partition and no logical partition.
Disk 81 - CHS 1245 255 63 - 9766 MB check_FAT: Incorrect size of partition 1 * FAT32 LBA 0 1 1 746 254 63 12000492 1 * FAT32 LBA 0 1 1 746 254 63 12000492 2 E extended 747 0 1 1244 254 63 8000370
TestDisk has been able to find the first partition but this partition is one sector bigger than the actual partition entry. Defrag has overwrite the beginning of the extended partition, clearing the logical partition entry.
* FAT32 0 1 1 747 254 63 12016557 [D DRIVE] D Linux 1023 1 1 1244 254 63 3566367
The user has choose to only recover the FAT32 partition. After a backup of its data, he has shrink the FAT32 filesystem to use one sector less. It's now time to recover the second partition. The user has manually add the second partition entry.
1 * FAT32 0 1 1 746 254 63 12000492 [D DRIVE] 2 E extended LBA 747 0 1 1244 254 63 8000370 5 L FAT32 747 1 1 1244 254 63 8000307
In Advanced, select the second FAT32 and RebuildBS. After a reboot and a little filesystem check, data were again available.
Recovery of cdrom session
With multi-session cdrom, it is possible to delete files of previous session. Because the files are not really deleted, it is possible to recover them. To read files from the first session, run under Linux
mount /dev/cdrom /mnt/cdrom -t iso9660 -o session=0
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