Segmentation error when trying to rebuild BS with TestDisk

[johnmac150]

I've been trying to recover a windows 10 C: drive using Ubuntu 20.04.4 and TestDisk. Drive became RAW for no apparent reason. I created a disk image using dd (sudo dd if=/dev/sdb of="/media/jmac150/New Volume/image.dd" bs=4K conv=noerror,sync status=progress) and ran TestDisk against it. TestDisk advised that both boot sector and backup were ok. However, when I tried to rebuild the boot sector, it failed with "Segmentation fault". I have attached screenshot of Segmentation fault.

Screenshot from 2022-03-20 14-57-12.jpg (34.96 KiB) Viewed 8356 times

Any advice gratefully received.

[recuperation]

Use Testdisk 7.2 WIP.
Are you using Testdisk in a virtualized environment?

[johnmac150]

I'll try 7.2
I am using Ubuntu in a dual-boot environment

[cgrenier]

It may be a bug fixed in April 2020: https://github.com/cgsecurity/testdisk/ ... 1529827fed
Please let me know of the results with latest TestDisk 7.2-WIP.

[johnmac150]

Hi

I've been trying to install testdisk-7.2-WIP.linux26-x86_64.tar.bz2.
Extracted it and checked the README.md file.
It advises "To build from source, read [INSTALL](INSTALL)" but I cannot find INSTALL in the folder. Can you help?

[recuperation]

Read the manual testdisk.pdf.

[johnmac150]

Eventually found that all I need to do is run sudo ./testdisk_static. No installation needed (I don't think...)

[johnmac150]

TestDisk 7.2-WIP solved the Segmentation problem and I managed to rebuild the BS. However, when I tried to rebuild the MFT, error message was that "MFT and MFT mirror are bad". Is there anything I can do to recover the disk?
Thanks.

[recuperation]

If the dammage exceeds what Testdisk could repair, third party software could still be able to evaluate the remains of metadata such as MFT in case of having used NTFS as file system.