Quote:
Originally Posted by geekmaster
It may also keep a clock/calendar chip powered (low power like a digital watch). Some devices can power themselves on at preset times. Not sure about the kindles though...
In reference to this thread, this "off" mode should prevent indexing.
Perhaps "mostly off" is a better term. 
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One difference between the two modes is that if you leave WiFi/3G on, in sleep mode the Kindle will occasionally wake up and "phone home" to Amazon. Eg if you have a newspaper subscription, your daily newspaper will download while your Kindle (and you) are asleep. It doesn't do that in "mostly off" (I like that!

) mode.