The FSCTL_GET_RETRIEVAL_POINTERS request message requests that the server return a variably sized data element, StartingVcn, that describes the location on disk of the file or directory associated with the handle on which this FSCTL was invoked. It is most commonly used by defragmentation utilities. This data element describes the mapping between virtual cluster numbers and logical cluster numbers.The STARTING_VCN_INPUT_BUFFER data element is as follows.
