You probably got a false negative. M. luteus should be oxidase +. To determine M. luteus do a MSA plate which should not produce acid and barley grow.
The volume name, or label, is a name you can assign to each drive on your system. The conversion (and some other utilities) will ask you for it as a way to confirm that you're really asking them to operate on the drive you think you are. We'll look at how to see, and set, the volume name on your drives.
The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is Ï (the lower case Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: