3.1.4.1.1.2 Parameters to IVolumeClient and IVolumeClient3

In the client processing outlined in the following sections, when calling methods in IVolumeClient3 rather than IVolumeClient, references to the DISK_INFO structure MUST be replaced with DISK_INFO_EX; and references to the REGION_INFO structure MUST be replaced with REGION_INFO_EX. Similarly, a call to EnumDisks MUST be replaced with a call to EnumDisksEx; and a call to EnumDiskRegions MUST be replaced with a call to EnumDiskRegionsEx.

In the call order descriptions, if any prerequisite calls fail, the call order cannot proceed.