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No they sync and check for items if for when you have downloaded new books via the wireless connection and/or when you have multiple Kindles. If you enable syncing and you turn on the wireless before you stop reading you can pick up where you left off in a book on one kindle on another kindle or app for kindle. So you finish reading a chapter on your IPhone and you want to read more on your Kindle. You turn the wireless on on your Kindle and sync to the farthest page read. Now you can continue on reading with little effort.
The USB is a traditional drag and drop. There is no need to check for anything because you have placed the book on your Kindle.
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