lately we've bought 5x X300 Thin client for the internet cafe and installed it with True Cafe and its working ok. the problem we are having with customers, is that, they wants to access  their flash drive and not for other customers to view it. Is there any way to get it working? please need help urgently. Thanks very much in advance

Try using the USB port allocation facility in the X300 Console or ask your supplier to help you. Try seacrhing the forums for the information you are looking for.

There is a technical document that addresses USB Port Assignment available in the Solution Knowledge Base (http://www.ncomputing.com/support.aspx). Search for "USB Port" and it should be first result.