Published: April 14, 2026 | Reading time: 7 minutes

In this post, we’ll tear down what ftdibus.sys really is, how it works, common issues, security considerations, and best practices for managing it. ftdibus.sys is a kernel-mode driver file developed by Future Technology Devices International (FTDI) , a Scottish semiconductor company famous for its USB-to-serial converter chips (the FT232x series being the most popular).

C:\Windows\System32\drivers\ftdibus.sys