It has recently been brought to our attention that some Archos 101 IT tablets are having USB host problems.
If your tablet does not recognize your storage USB device, we recommend to test the USB host function with a regular USB keyboard or mouse, as your storage USB device may not be supported. If your tablet still does not recognize simpler devices, then you should contact Archos support to confirm the failure and issue an RMA to get a new device.
Current user feedback shows that this issues occurs more frequently on devices with board version 5.
You can identify your board version going in Settings/About device, the board version will be in the bottom of the list. (v5 means version 5)