You can enable the Fast USB Write option in the Performance tab. You will need to properly unmount the USB disk if you select this option; otherwise, you should run a file system check on the disk before accessing it next time. With RAIDiator 3+, you can use the front Backup button to unmount and mount a USB disk. Depressing the Backup button for 5 seconds until the disk LEDs blink will unmount a mounted disk or mount an unmounted disk.