Windows7系统itunes下载的文件在：C:\Users\你的用户名\AppData\Roaming\Apple Computer\iTunes\iPad Software Updates
XP系统itunes下载的文件在：C:\Documents and Settings\用户名\Application Data\Apple Computer\iTunes\iPhone Software Updates
WindowsVista系统itunes下载的文件在：C:\Users\用户名\AppData\Roaming\Apple Computer\iTunes\iPhone Software Updates
Mac系统itunes下载的文件在：user/资源库/itunes
