Can't move files to Udrive

Hey guys. So, recently, my Mac has been at the point where files need to be moved.
I have a 8 terabyte Udrive. I do a lot of video editing. So the catagory thats using my Mac up the most is movies/.mov files.

I tried to move a bunch of my .mov files over, left it to do it's thing. But came back to a message of some sort saying something like "Can not move <filename> because it is being used" I have all my programs closed other then chrome, and finder. So, I hit ok on the message, and it cancelled all the other file transfers.

Any help?

The next time you get that message, open your Activity Monitor application (Applications, Utilities, Activity Monitor.app) and check to see which program or process is keeping the file(s) open. When you find which one is guilty, highlight it and press the small stop sign (Quit Process) at the top menu. That should release the file(s) for copy or move.

chscag said:

The next time you get that message, open your Activity Monitor application (Applications, Utilities, Activity Monitor.app) and check to see which program or process is keeping the file(s) open. When you find which one is guilty, highlight it and press the small stop sign (Quit Process) at the top menu. That should release the file(s) for copy or move.

Click to expand...

Thanks chscag. That's exactly what I needed. But another question i have is how do I move the files over? I do not want to copy them over. I'm moving them because im running out of room on my Mac.

Moving files can be risky, especially large ones. If something goes amiss during the move you may lose the original file. We recommend copying the files first and after ascertaining that they have been copied OK, delete them from the source. I know that process is time consuming but if you value your files, safety first.

chscag said:

Moving files can be risky, especially large ones. If something goes amiss during the move you may lose the original file. We recommend copying the files first and after ascertaining that they have been copied OK, delete them from the source. I know that process is time consuming but if you value your files, safety first.

Click to expand...

Thank you. One more thing. How do I go about actually deleting files..? Not just moving to .trash