[Plugin: W3 Total Cache] Newbie, Status: not cached

Hi, I’m totally to the caching technology.
In page cache debug, it always say status: not cached.
I’m not login to WordPress, not sure if it suppose to this status?
It happened in all pages/posts.

Here is how debug said:

<!-- W3 Total Cache: Minify debug info:
Engine:             disk
Group:              education-landing
-->

<!-- W3 Total Cache: Page cache debug info:
Engine:             disk
Key:                w3tc_ab3949c84fe1a79dee513e52aa582ba0_page_a58831d29d800f30ef5b3b95d531de9c_gzip
Caching:            enabled
Status:             not cached
Creation Time:      0.584s
Header info:
X-Powered-By:       W3 Total Cache/0.8.5.2
Pragma:             public
Expires:            Tue, 06 Jul 2010 07:45:15 GMT

Please help.