Can Access All Sub Folders And Files Fine / Cannot Move Folder

I was moving about 450gb of music from my old external (which was almost completely out of space, 465gb) to an internal 1tb drive. I was installing/setting up a program, thinking 'no way this will affect the file transfer', when suddenly that program gave an error (can give specifics on this if needed). Immediately after, my files stopped moving. It said 'delayed write failed, data has been lost' or something like that. I looked on my external, and it was empty. At this point i was rather upset because i thought i had lost years worth of music. Since I thought i had lost all my data, i tried one of those recovery programs("diskdigger") And it couldn't even access the drive. Gave an error, then showed it as 0gb. But the drive properties still showed 300+ gb even though the only folder in it was shown as empty.

So, i did the classic windows fix-all, restarted. My computer would not even go past the motherboard boot screen for 5 minutes. At this point i was about to jump out the window, but i restarted again and it worked. I went to my external, all my folders were there, i could open all the subfolders, play the music with vlc, etc. BUT now when i try to move the folder with all my music, it says "Cannot move file: Cannot read from source file or disk".