win7 五台電腦都是win7嗎? try this.... HOTFIX SHARE FOR WIN7 & Server 2008 R2 USB device may intermittently disconnect and reconnect when you use the USB device in Windows 7 or in Windows Server 2008 R2 X86: http://thehotfixshare.net/<wbr>board/index.php?showtopic=<wbr>15338 X64: http://thehotfixshare.net/<wbr>board/index.php?showtopic=<wbr>15337