There are many such tools around that can. I know that I can see the list of open processes in activity monitor but I think its happening to quickly for me to see it. How To Find Files Faster Using Spotlight Keyword Searches Ads Folder Size Search Get-Process -Id Get-NetUDPEndpoint -LocalPort Your_Port_NumberOwningProcess. . Drag the icon and drop it on the open file or folder that is locked. See what process is using a file in Mac OS X. When the Trash folder would be opened you can view all the deleted files that are stored on it temporarily. Openfiles findstr i. The reason for this is Im using a framework and I think the. So now none of the processes are using mnt and it can be safely unmounted. As you might expect a good task manager is able to display which open process is accessing the hard drive and by how much in addition to CPU and memory usage etc. To find if a particular file is being in use by a...