There is difference between what ASM is reporting as the disk size and the actual size ans this is b

There is difference between what ASM is reporting as the disk size and the actual size ans this is because the OSE partitioned the disk incorrectly which is leading to more thant hald the disk not being used.  Can I expand the partition with affecting asm or what is the proper process to get the rest of the disk back.

>cat /sys/block/sdt/size

440401920

((440401920 * 512)/1048576) = 215040

But according to ASM this LUN is only 74G.

>/usr/sbin/cvuqdisk -size /dev/oracleasm/disks/ASM_DISK1

73441147

> select TOTAL_MB,OS_MB from v$asm_disk where path = '/dev/oracleasm/disks/ASM_DISK1' ;