Question: I copied 3.62 GB of data on to a re-writable DVD instead of erasing it. Now there is no data on the disc but it shows used space as 3.62 GB and 690 MB of free space. Now I am unable to erase my disc. What should I do to erase the disc and get the space back?

Answer: 
Another free alternative:

[ImgBurn](http://www.imgburn.com/)

![ImgBurn](https://i.stack.imgur.com/BVxpl.png)
As stated elsewhere, you need to erase the DVD-RW before using it again. I have a very simple low profile program I use called Active@DVD Eraser located here:<http://www.ntfs.com/dvd_eraser.htm>