H2SO4

Yeah, that's it. See that list to the right of the "132"? The one that starts with AudioEndpointBuilder and ends with wudfsvc? That's the list of individual services running inside the "service host" (SVCHOST) process that is apparently chewing disk on your machine after you cancel the copy.

I still suspect that this is down to a filter driver which can't handle 'cancel' very well, and the problem will not be trivial to troubleshoot. I'd suggest:

1) Boot to safe mode and check whether the same thing happens when you copy in there. The outcome is significant.

2) Make sure all your work is saved (this step could potentially bork your machine and cause you to need to reboot), then start a CMD prompt and try stopping each one of those services and then testing the copy again in between:

NET STOP AudioEndpointBuilder
<try the copy>
NET STOP CscService
<try the copy again>
NET STOP...