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.
A volume group (VG) is a logical collection, or purposeful grouping, of computer storage space that may span multiple physical devices. It combines both physical and logical volumes into a single administrative element within UNIX&reg and LINUX&reg logical volume management (LVM). A physical volume may be an internal or external storage device. Logical volumes are concatenations, or chained lists, of storage space that might join portions of several physical volumes. Under LINUX&reg, the volume group is the highest level of abstraction, or visualization, in its logical volume manager utility.