kIOMediaPartitionID is property of IOMedia objects. It is an OSNumber.
#define kIOMediaPartitionID "Partition ID"
The kIOMediaPartitionID property is placed into each IOMedia instance created via the partition scheme. It is an ID that differentiates one partition from the other (within a given scheme). It is typically an index into the on-disk partition table.
© 2000 Apple Computer, Inc. (Last Updated 2/23/2000)