I had a dual booted PC ( Windows and Debian in HP notebook with 1 TB hard-disk) and from few months Windows cannot starts ( because one day I was in hurry change size of two of partitions using "gparted' and to fix this I had many solutions but failed) so, yestarday I decided to fix it by using HP system recovery option. When I run system recovery whole system was freezed for more than half hour so, I decided to forcefully shutdown machine by pressing power button after that I power on my machine BIOS message shows "No operating system found" ( all EFI files are deleted even which are in HP folder) and I ended up with like this
/dev/sda1 567296 158795775 158228480 75.5G Microsoft basic data /dev/sda2 158795776 159942655 1146880 560M Microsoft basic data /dev/sda3 1920552960 1953513471 32960512 15.7G Microsoft basic data /dev/sda4 2048 567295 565248 276M EFI System And an un-allocated space of 839.4 GB. I mainly concerned about data in Linux partition data (which was in sda8). Is there a way to recover data from un-allocated space? I can send any kind of log if required. Any help would be greatly appreciated. Thanks.
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