Using Toast 3.5.6 or newer with a compatible CD-RW drive, launch Toast and insert the CD-RW disc into the recorder. From the Recorder Menu pull down to Disc Info, in the window that appears there is an Erase button click it. You will be prompted with another dialog box giving you three options Cancel, Quick Erase, Erase. Select the option best suited to your needs (only use Quick Erase when the disc is to be used with Toast).