FRITZ!Box 6490 Cable Service - Knowledge Base

FRITZ!Box 6490 Cable Service

USB storage device is not detected by FRITZ!Box

The FRITZ!Box does not detect a USB storage device. After connecting it to the FRITZ!Box, the USB storage device is either not displayed at all under "Home network > USB Devices > Overview of Devices" in the user interface, or it is displayed as an "unknown" device.

Simply proceed as described below. After each measure, check whether the issue persists.

1 Restarting the FRITZ!Box

Restart the FRITZ!Box while the USB storage device is connected to it:

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Backup" in the "System" menu.
  3. Click on the "Restart" tab.
  4. Click the "Restart" button.

2 Testing functionality of a USB storage device

  • For testing purposes, connect the USB storage device to a USB port on your computer.
    • If the computer also does not recognize the USB storage device, then either the USB storage device or the USB cable is defective. In this case, contact the manufacturer.

3 Connecting the USB storage device directly to the FRITZ!Box

The following step is only necessary if the USB storage device is connected to the FRITZ!Box by means of a USB hub:

  • For testing purposes, connect the USB storage device directly to the FRITZ!Box (i.e. without a USB hub).
    • If the USB storage device is now detected, then the USB hub is defective or it does not support the USB storage device you connected.

4 Using an external power supply

The FRITZ!Box supplies USB devices with a maximum of 500 mA in accordance with the USB specification. Perform the following step if the USB storage device's power consumption exceeds this:

Note:USB hard drives that are larger than 2.5" in size normally require more than 500 mA and often come with a Y cable in order to attach them to two USB ports to supply sufficient power. However, they can still often be used on a single USB port because many computers are equipped with USB ports that supply more than 500 mA.

  • If a power adapter was included with your USB storage device, use the USB storage device's power adapter to plug it in.
    • If a power adapter was not included, connect the USB storage device to the FRITZ!Box by means of a USB hub with its own power adapter (active USB hub).