What does "C:0" in the path mean?

Hello,

When I use the Resource Monitor to check the disk usage on our file server, I noticed the file path has "C:0\" or "C:1" at the front. The server is being used to store roaming profiles and redirected user desktop and these files seem to be the redirected ones which are stored physically on a different drive on the server.

Would someone know how that works or can at least point me to some documentation? I've tried searching it but not much returned in the result.

Thanks in advance.

Lawrence