I was trying to reformat my old Windows laptop and replace the OS with Ubuntu 14.04.4 using Unetbootin. I did not have a Flash pen drive at the time so I used my external hard drive to boot and install Ubuntu. The external HD contained more than 300GB of files in one folder plus the Ubuntu ISO file. During installation, I chose to delete all Windows related files in the laptop and replace it with Ubuntu (it was an option in the Ubuntu installation), thinking that when I restart the laptop after installation, Ubuntu would have replaced Windows in drive C.
Unfortunately, Ubuntu was installed in the laptop but it did not replace the Windows (so I can both boot in Windows in Ubuntu). Worse, all files in the external HD were deleted, and were replaced by files in drive C of my old Windows laptop.
My goal is to recover all the lost files in the External HD. My plan is to use Recuva. But to complicate things, I cannot access my external hard drive using a Windows laptop. Although it is recognized as a "device", it does not appear as an as an option in "This PC". Note that this external HD is accessible through a Ubuntu laptop.
So my question are:
1) How can I make the external HD accessible using a laptop with Windows OS?
2) With the "background story" in mind, what steps can I do to recover the files, if you think Recuva is not enough?
Before writing this, I have read some of the related questions and I would like to say that I am grateful for the help this community offers to end-users like me.