Since CD-Rs in general cannot be logically erased to any degree, the disposal of CD-Rs presents a possible security issue if they contain sensitive / private data. Destroying the data requires physically destroying the disc or data layer. Heating the disc in a microwave oven for 10–15 seconds effectively destroys the data layer by causing arcing in the metal reflective layer, but this same arcing may cause damage or excessive wear to the microwave oven.