"There are plenty of software utilities on the market which help you to lock down USB ports on your network, but there are few hardware-based solutions. As it seems many businesses are becoming increasingly concerned about the growing threat of malware on USB devices, Lindy has jumped on the
bandwagon with its USB Port Blocker. The low-cost package (=A314.99) consists of a combined 'key' and 'lock' assembly, which plugs into the USB
port on either your desktop or laptop computer (PC or Mac, it's not fussy). At first glance it's hard to distinguish the USB Port Blocker from a USB flash memory drive, but on closer inspection you'll notice that something is usual - the USB Blocking port has a removable part."