The discontinued Sharp Actius MM10 Muramasas was described in some sources as thinner than the Macbook Air , being 0.54 inches ( 14 mm ) thick at its minimum .
The Sharp Actius MM10 Muramasas , a thin , tapered notebook , had a minimum height ( thickness ) of 0.54 inches ( 14 mm ) and a maximum height of 0.78 inches ( 20 mm ) .