The media check built-in to the YDL 6.0 installer does function.

Or, you may also conduct a media check prior to burning the ISO, from
the command line as follows:

        sha1sum /[path]/[to]/[ydl].iso [ENTER]

... which will output a SHA1SUM which you compare against the SHA1SUM in 
the SHA1SUM file.


To check your media from Windows, select one of the tools mentioned here:

        http://www.labtestproject.com/win/sha1sum.exe.html


To check your media from OSX, follow the instructions posted here:

        http://www.bresink.com/osx/sha1.html