Chkdsk hanging?

Not sure where this goes but it's happening on my Windows 10 computer.

I'm running Chkdsk on an external drive and it gets to, Stage 2: Correcting error in index $I30 for file 27, then it appears to stop. 

I tried running it in what I think is called the windows environment, but the drive is not even recognized there.

I let it run overnight and it's still the same. It could be because the drive is over 18 TB but how can you tell?

Nothing is apparent that you say something is happening. There's just a blinking cursor and that's it.