|Description||string||DiskPartitions can be directly realized on a PhysicalMedia. This is used to model the creation of Partitions on a raw SCSI or IDE drive, using the fdisk (DOS and Unix) or pdisk (Unix) command. The StartingAddress of the DiskPartition on the PhysicalMedia is also specified as a property of this relationship. An alternative is that Partitions can be BasedOn StorageVolumes, such as a VolumeSet or a Volume exposed by a hardware RAID cabinet. The latter relationship is modeled using the DiskPartitionBasedOnVolume association.