Partition: Read error

How to use TestDisk to recover lost partition
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IMarvinTPA
Posts: 3
Joined: 04 Mar 2015, 07:39

Partition: Read error

#1 Post by IMarvinTPA » 04 Mar 2015, 07:49

I have a drive that seems to have lost its MBR. I'm not sure what to do at this current point. The log files seem to indicate that it is seeing a FAT table and whatnot.
Hard disk list
<Good drives listing removed>
Disk /dev/sdc - 80 GB / 74 GiB - CHS 9729 255 63, sector size=512 - Seagate External Drive, S/N:J5TVK9VT

Partition table type default to Intel
Disk /dev/sdc - 80 GB / 74 GiB - Seagate External Drive
Partition table type: Intel

Analyse Disk /dev/sdc - 80 GB / 74 GiB - CHS 9729 255 63
Current partition structure:

Partition: Read error

search_part()
Disk /dev/sdc - 80 GB / 74 GiB - CHS 9729 255 63
FAT32 at 0/1/1
FAT1 : 32-19105
FAT2 : 19106-38179
start_rootdir : 38180 root cluster : 2
Data : 38180-156296291
sectors : 156296322
cluster_size : 64
no_of_cluster : 2441533 (2 - 2441534)
fat_length 19074 calculated 19075
file_pread(6,16,buffer,2111(0/33/33)) ReadFile Data error (cyclic redundancy check).

file_pread(6,1,buffer,2112(0/33/34)) ReadFile Data error (cyclic redundancy check).

file_pread(6,16,buffer,2113(0/33/35)) ReadFile Data error (cyclic redundancy check).

file_pread(6,1,buffer,2113(0/33/35)) ReadFile Data error (cyclic redundancy check).

file_pread(6,2,buffer,156303360(9729/110/46)) lseek err Invalid argument
file_pread(6,1,buffer,156303360(9729/110/46)) lseek err Invalid argument
file_pread(6,1,buffer,156303359(9729/110/45)) lseek err Invalid argument
file_pread(6,14,buffer,156303361(9729/110/47)) lseek err Invalid argument
file_pread(6,3,buffer,156303375(9729/110/61)) lseek err Invalid argument
file_pread(6,3,buffer,156303422(9729/111/45)) lseek err Invalid argument
file_pread(6,8,buffer,156303438(9729/111/61)) lseek err Invalid argument
file_pread(6,11,buffer,156303485(9729/112/45)) lseek err Invalid argument
file_pread(6,2,buffer,156305407(9729/143/14)) lseek err Invalid argument

Results

interface_write()

No partition found or selected for recovery
At this point, I'm not sure what to do. I am considering putting the drive in a linux machine and making an image to a bigger drive. I have used photorec and have recovered some files.

Windows does not assign the drive a letter. If I try to do anything to it in the Computer Management, it asks me if I want to initialize the disk with an MBR or GPT. I have so far refused to do either.

Thanks,
IMarv

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cgrenier
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Re: Partition: Read error

#2 Post by cgrenier » 04 Mar 2015, 07:51

You should clone the disk using gnu ddrescue to a new empty disk.
Once the copy is done, remove the original disk and use TestDisk on the clone to recreate the partition table.

IMarvinTPA
Posts: 3
Joined: 04 Mar 2015, 07:39

Re: Partition: Read error

#3 Post by IMarvinTPA » 05 Mar 2015, 13:35

The cloned drive reports that there is no end marker for the partition. Can I create a partition that uses min-max values since the drive only ever had one? ddrescue could not recover only the first 8k of the drive, everything else was retrieved successfully it thinks.

Thanks,
IMarv

IMarvinTPA
Posts: 3
Joined: 04 Mar 2015, 07:39

Re: Partition: Read error

#4 Post by IMarvinTPA » 10 Mar 2015, 01:35

In my case, I got lucky, only the first 2048 bytes seemed to have been bad.
All I needed to do was create a MBR and a partition of 0/1/1 to the end with the right file system type and it found everything. I don't know if the real drive can be fixed, but the image was.

Thanks,
IMarv

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