Optically pumped InGaAs/InGaAsP multiquantum well microdisk lasers wafer-bonded to sapphire lase continuously at room temperature. A threshold pump power of P-th = 1.1 mW at pump wavelength lambda = 0.85 mu m is measured for a 4.5 mu m diameter disk with lasing emission wavelength near lambda = 1.6 mu m.