2.2.8.2.4 SMB_QUERY_FS_SIZE_INFO
This information level structure is used in TRANS2_QUERY_FS_INFORMATION Responses (section 2.2.6.4.2) to return extended allocation and size information of the object store underlying the share specified in the request.<172>
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SMB_QUERY_FS_SIZE_INFO { LARGE_INTEGER TotalAllocationUnits; LARGE_INTEGER TotalFreeAllocationUnits; ULONG SectorsPerAllocationUnit; ULONG BytesPerSector; }
TotalAllocationUnits: (8 bytes): This field contains the total number of allocation units assigned to the volume.
TotalFreeAllocationUnits: (8 bytes): This field contains the total number of unallocated or free allocation units for the volume.
SectorsPerAllocationUnit: (4 bytes): This field contains the number of sectors per allocation unit.
BytesPerSector: (4 bytes): This field contains the bytes per sector.