The VPSM shows the allocated space on a volume and the space that remains free. The space within the first 65,520 cylinders is called the track-managed space. The VPSMs for this area contains bit maps of the cylinders and tracks on the volume. A value of one indicates that the cylinder or track has been allocated; zero, that it is unallocated. The space after the first 65,520 cylinders is called the cylinder-managed space. The VPSMs for this area contains bit maps of only multicylinder units. Individual cylinders and tracks are not mapped in this type of VPSM. A value of one indicates that the multicylinder unit is allocated; zero, that it is unallocated.