1] Run CHKDSK Using CHKDSK is also one solution that is proven to be effective to fix the Invalid MS-DOS Function issue. To run CHKDSK, do the following: Press the Windows key + R.

BUYANG LI, HUADONG GAO, WEIWEI SUN, UNCONDITIONALLY OPTIMAL ERROR ESTIMATES OF A CRANK–NICOLSON GALERKIN METHOD FOR THE NONLINEAR THERMISTOR EQUATIONS, SIAM Journal on Numerical Analysis, Vol. 52, No.