What is the difference between a 3020 and a 3030? Is it just the size and number of disks? -- Brent L. Bates NASA-Langley Research Center M.S. 294 Hampton, Virginia 23665-5225 (804) 864-2854 E-mail: blbates at aero4.larc.nasa.gov or blbates at aero2.larc.nasa.gov