_CM_DISK_GEOMETRY_DEVICE_DATA

headersMetadatacopy
struct _CM_DISK_GEOMETRY_DEVICE_DATA {
    unsigned long BytesPerSector;/* 0x0  4 */
    unsigned long NumberOfCylinders;/* 0x4  4 */
    unsigned long SectorsPerTrack;/* 0x8  4 */
    unsigned long NumberOfHeads;/* 0xc  4 */
};
/* computed from the NT 4.0 DDK headers */