Nero DiscSpeed tells you the speed of the available CD/DVD drives. Results can be viewed either as a graph or as a test log. Nero DiscSpeed also creates special test media for data and audio. The Nero DiscSpeed main screen is the starting point for all actions that you perform using Nero DiscSpeed. The drop-down menu lists the optical drives available on the computer using their exact model designations. It also displays the version number of the firmware installed on the drive. You can switch between tabs within the main screen. These tabs are used to carry out the different tests and to display information regarding them.
Use 7zip to extract the DiskSpeed files and avoid crap like Open Candy and the like.
These installers are simply a wrapper/container and part of that wrapper is the adware bundles, 7zip can pull the DiskSpeed executable from the container easily and you can install the program crap-free from there.
Just use 7zip to extract DiskSpeed from the crapware wrapper/installer that CNET (and others) use. You can use it on any installer(s) like these that bundle adware with something you want.