In a previous Centos 6 install, Windows 10 was installed months ago and the Centos 6 GRUB file was updated to select dual boot by disk name.
Recently, due to some kind of error in a reboot, the disk order was changed and Windows tried to boot from an array partition (which contained no OS, only data), destroying it and just leaving a 150 something Mb boot partition where there was a full disk XFS partition.
Now I have that array in this state:
GUID partition table
+150 something Mb NTFS file system (presumably the Windows boot partition that destroyed the previous partition)
+10 Tb empty space
I am sure the disk was overwritten by Windows boot and I need to restore the previous partition and access the previous data, but I'm doubting which is the best procedure in this case:
a) Should I delete the NTFS boot partition and try a full testdisk disk recovery?
b) Should I delete the NTFS boot partition and use fdisk or similar to automagically restore the previous partition?
c) Should I use low-level recovery software to try to recover as much raw data as possible since all hope of a clean restore is gone?