Lately I have been using Chrome and Safari for youtube (Html5). I have my default cache folder for everything located on an external USB3 drive so my Fusion(SSD) stays at lower writes for a prolonged life. Using iStat Menus I have been monitoring which drive is receiving the writes and which isn't while viewing HTML5 youtube videos. Chrome has been writing to the external USB3 drive while Safari is still writing to the SSD. Both cache folders are located on the external so my question is. Where does Safari store it's HTML5 video cache if not in the default cache folder where it stores the rest of the cache from browsing? I have even checked the safari cache folder size before and after watching a youtube video in safari and it the file size has not changed. It is writing to an alternate location outside of the system's cache folder.