My Pasport 1tb spike lag on windows 8

hi i recently buy my passport 1tb usb 3.0… it has no issues when i plug in windows 7 but when i pluged in window 8 the hard drive was detected and can open any folder but its lagging and when i try to copy file the hdd was stop and go…  i have 3 pc… 2 is on win 7 and 1 is on win 8… the 2 other computer with os 7 had no issue at all… only in win 8… i wonder what to do to fix it… i already update the firmware and install ses driver…


Please run a diagnostic on the drive using Western Digital Data Lifeguard Diagnostic tool to verify if there is anything wrong with it.