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.
Physical Volume: Physical Volumes are actual hard-disks or partitions, that you normally mount or unmount on a directory. Volume Group: Volume Group is a group of multiple hard-disks or partitions that act as one. Volume Group is what is actually divided into logical volumes. In layman terms Volume Group is a logical hard-disk, which abstracts the fact that it is built from combining multiple harddisks or partitions. Logical Volume: Logical Volumes are actual partitions created on top of the Volume Group. These are what will be mounted on your system.