Forum Moderators: open
User-agent: Mediapartners-Google*
User-agent: Mediapartners-Google/2.1
Disallow: /
I banned Mediapartners-Google years ago, and also ban other specialized G bots, all with no ill effects. ('Regular' Googlebot is as aggressive as ever. Almost too much so, actually.) FWIW, from my robots.txt --
# No G Ads
User-agent: Mediapartners-Google*
User-agent: Mediapartners-Google/2.1
# No RSS
User-agent: FeedFetcher-Google
User-agent: FeedFetcher-Google;
# No, thanks
User-agent: Googlebot-Image
Disallow: /
It is the bot they use to view your page to determine what kinds of ads to place there. If you block it, you may end up with either an email from Google telling you to let it back in, nothing but public service ads, badly targeted ads. or no ads at all.
JK