wvcherrybomb, as I understand it, when you add books the Kindle will put all the words in its index, creating a new file for that book in the search folder. When you delete a book the index for that book isn't deleted. When you do a search for anything in My Items the Kindle will look in every one of the files in the search folder, whether the book is on the Kindle or not. And in my case I notice slower page turns, the dictionary seems slower, I am charging it more than usual and a couple of other little things. If I remove the search files and do a restart I immediately notice an improvement in the features I use most. It's not as quick as when I only had a couple of hundred books, but it is a lot quicker with the books I decided to keep on the Kindle. Bottom line - if you do a lot of adding and deleting of books then this is probably a good habit to get into, if you add lots of books and only delete a couple it really is worth the hassle. I only use it when I have been going crazy with adding and deleting, or if I decide to cut my library down to one page or something. And I do it only if I'm somewhere I can keep it plugged in for a day or so - indexing is a big drain on the battery.
I haven't heard of anyone really getting a virus on the Kindle. I guess that if you opened an email on the Kindle it could get transferred to your computer and do harm, but I haven't heard of this either. Right now I would say it can't be done, but I would also bet that there are enough nuts out there that like to disrupt other people's enjoyment that it will happen someday and we will have to get anti-spyware and antivirus for the Kindle. I just hope it is a long time from now.
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