Hi Rohin
I am Dave, an Independent Advisor, I will help you with this . . .
You are using that Repair Drive form inside Windows 10, it is safe to stop that process, no harm will come to your drive, however, if that is stalled, then that would indicate a problem on your external drive, which it cannot fix . . .
Shut your PC down, wait a few seconds, then start it again and check to see if you can access that drive . . .
The best option is to run a full check Disk on that drive
Click your Start Button, then just type cmd
From the resulting menu, right click Command Prompt and choose 'Run as Administrator'
Paste this commend into Command Prompt and press Enter:
chkdsk F: /f /r
Wait for that command to complete, that will take a while . . .
Please provide a screenshot of the results of running that scan . . .