scsiaccess.exe is an executable for Alcohol Software's CD/DVD writing application, Alcohol 120%. It is an essential process which is needed in order for this application to work.
Non-system processes like scsiaccess.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues