I would say the method last posted by myself (some 4 posts up I think) is the easiest one. It requires that you have osso-xterm and becomeroot installed, however. It won't break your n800.

As a matter of fact I'm not entirely sure what metalayer-crawler does.. or rather, what it's good for.. I'm pretty certain it's about looking all over the cards to find media files which can be indexed in advance for the media player or maybe also some other applications, or something to that extent.

However, I can still use both the media player and the photo application after I disabled the crawler.. go figure. In any case, personally I hate the concept, I much prefer to have a standard normal file browsing feature in the applications and look up what I want to access that way.