The blanking process with CBurner is very simple, just select the "Erase Rewritable Disc ..." in the Recorder Menu and you will see a dialog box asking which drive you want to erase or format. Only those units that already have a rewritable medium will appear; if you insert a CD or DVD after the dialog box appeared, the program automatically adds to erasable list, or removes them if it was removed.
If the system has more than one burner is possible to delete multiple CDs or DVDs at a time.
Download CBurner 0.6 here: http://www.civis-software.com/products/cburner/