To erase data from a rewritable disc, obviously you need CD/DVD burning software installed on your system but Windows 7 give you a built-in option to erase rewritable CD or DVD which allows users to perform that task easily without the help of any third party application.
How to erase rewritable Cd / DVD in Windows 7
Just insert CD/DVD in the disc drive, then open “My Computer” and under “Devices with Removable Storage“, right click on CD/DVD-RW Drive and click on Erase this disc
It’ll ask to start the wizard so just click Next
It will start erasing data from disc and complete the process just in few seconds