Linux – Killing all instances of Chrome on the command-line

You can't close a tab by killing the process. The process represents a renderer that the main browser uses the execute and draw a page, which it then copies to the screen. The "Aw, Snap!" is what the browser displays when the renderer responsible for that tab crashes or is killed. The proper way to close the tab would ideally be via a command-line switch, but there is none that I know of at this time.

Open resource monitor, and go to the disk tab. The top pane will tell you what processes have disk activity, and the lower pane will tell you with more detail what the are viewing/writing etc.