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thanks for such good explanation. I will try the same after ordering a 2TB disk. I will update the performance of photorec compared to professional tool. In the previous comment, It was mentioned that the tree structure with actual name will be lost. Does that mean All my project data will be lost ...

Thanks for suggesting the sudo option. As after using the sudo, I am able to see the external disk.
One more question is - do i require an addition 1TB harddisk to store what is recovered by PhotoRec from my current external harddisk? Is there an option to just update the filesystem index of ...

I accidentally used the following command -
diskutil eraseDisk HFS+ "WIN10" GPT /dev/disk3

I wanted to use on disk2 (16GB pen drive) , and wrongly used on disk3 (2TB external harddisk). Hence the whole filesystem index is gone. Earlier it was an HFS+ file system as used by me to store the data ...