This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
If it is stored in the hard disk, then it's persistence storage. I don't think so
Well, its browser dependant but its going to be on the hard disk. On XP IE caches stuff mostly under C:\Documents and Settings\[username]\Local Settings\Temporary Internet Files. Firefox seems to store it here: C:\Documents and Settings\[urername]\Application Data\Mozilla\Firefox\Profiles\default.crm\Cache