I've update my iphone to the latest version thorough my itunes, but when i update my friend's iphone, it starts to redownload the whole thing again, so where does the update file goes after the 1st download?

It seems that i have to redownload the whole 800+ MB of the update file again when i want to update my friend's iphone through my itunes, I've updated MY iphone to the latest version after very very long hours of download, and i tried updating a 2nd friend's iphone and it was very fast as the file has already been downloaded, but this problem occurs when i want to update a 3rd friend's iphone, can someone help?

OS X:~/Library/iTunes/iPhone Software Update
Windows XP: \Documents and Settings\username\Application Data\Apple Computer\iTunes\iPhone Software Updates
Windows Vista & Windows 7: \Users\username\AppData\Roaming\Apple Computer\iTunes\iPhone Software Updates

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