Hide data on cd or dvd

First compress the data which you want to hide using winrar , you will get a rar file.

Now you rename the .rar file to .iso

Now using nero burn it to a cd or dvd. After this you see the magic! you see the content of the cd empty

To retrive the data make a iso image of that particular cd and rename it to .rar and extract the data using winrar

Even you can add password for that rar file

It is extremely simple. This can be tried by all users.