INFO: ParentObjectTitleIndex in LogicalDisk Instance Definition (274560)

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On Windows NT 4.0, a physically disk is typically divided into partitions. Those partitions are also called logical disks. Because a partition always resides on a certain physical disk in Windows NT 4.0, the physical disk is called the parent of the logical disk. The Performance Library represents this relationship by setting the ParentObjectTitleIndex attribute of the PERF_INSTANCE_DEFINITION structure in the LogicalDisk object to point to the PhysicalDisk object.

On Windows 2000 and Windows XP, the system can have dynamic logical disks. Logical volumes that span multiple physical disks are more common. Partitions that reside on different physical disks can make up one logical volume. More often, there is no pure parent-child relationship between physical disk and logical partitions. So the Performance Library on Windows 2000 always sets the ParentObjectTitleIndex attribute of PERF_INSTANCE_DEFINITION in LogicalDisk object to 0 (zero).

On Windows 2000 and Windows XP, the physical disk is represented as a multiple instance object. The name of each instance reflects what logical volumes reside on the physical disk. For example, if disk 0 has several partitions on it, those partitions are part of logical volume C:, D:, and E:. The instance name is "0 C: D: E:".