Smart Sector Technology, a PowerQuest feature, results in imaging of data containing sectors only, bypassing those that contain no data or, obviously, empty sectors. I discussed an article from the November PC World magazine on Web privacy. The benefits of cookies is to allow Web sites to track your preferences and concentrate their presentations around these interests. Some people like this feature. Two of these third party cookies are recognizable with the names Doubleclick and Avenuea.
Some cookies have expiration dates, whatever that means.
My experience is that if the cookies folder content is not managed, it gets quite large. However, it is usually only around 32Kb. Another comment was that the JUNO ID and password were in the index.dat file because if deleted, JUNO asks for them the next time up. I think what is happening is that with the index.dat file removed, none of the cookies can be accessed and this is functionally equivalent to removing the cookies. My experience is that deleting from the TIF folder removes them from the Cookies folder, BUT, deleting from the Cookies folder does NOT remove them from the TIF folder.