| Subject | English | Welsh |
| comp., MS | compact disc read-only memory | cryno ddisg cof darllen-yn-unig (A form of storage characterized by high capacity (roughly 650 MB) and the use of laser optics instead of magnetic means for reading data) |
| comp., MS | read-only memory | cof darllen-yn-unig (A semiconductor circuit that contains information that cannot be modified) |