1. Connect handset via USB to PC. You should get a notification, "USB Connected".
2. Pull down the notification bar and select "USB connected". Confirm "mount" at the pop-up.
3. The SD card will now be available as a drive in Windows Explorer. Depending on the 'Autorun' settings on your PC it may even open in a window automatically.
4. To copy the files simply drag them from their existing folder on the PC to the SD card.
5. When finished, select "Turn off USB connected" and confirm "unmount" before disconnecting the handset.