The first 1.8-inch drives using PMR were the 40GB and 80GB models, which store 40GB on a single platter and are available in single-platter 40GB and dual-platter 80GB versions. These drives featured the highest areal density of any drives then on the market at 133Gb/sq. inch (206Mb/sq. mm). Although not normally used in PCs, these drives can be found in some of the extremely small and lightweight laptop systems such as the Toshiba Libretto.