SIENOC USB To RJ45 Lan Extension Adapter Cat5e Cat6 Cable Color Black Customers should Use standard above CAT5 copper wire. It extends the distance of a USB device from a USB enabled computer most up to 150 ft . If the USB harddisk cannot work,it might be the low power,you should power the harddisk with double head USB charger cable . If the cable doesn&#039;t work,customer should check if he has connected the cable well.You can try to reconnect it . the distance and adapters may affect the performance of some devices down to USB 1.1 speed .