MR_LdBlockSizeGet
ld_block_size = MR_LdBlockSizeGet(device_id, map_ptr);
extern u_int32_t MR_LdBlockSizeGet(u_int32_t ldTgtId, MR_FW_RAID_MAP_ALL *map);
u_int32_t MR_LdBlockSizeGet(u_int32_t ldTgtId, MR_FW_RAID_MAP_ALL *map);