Hi,
I have installed GRID Infrastructure services for standalone databases.
$ asmcmd
ASMCMD> lsdg
State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name
MOUNTED EXTERN N 512 4096 1048576 16378 16317 0 16317 0 N DATA/
MOUNTED EXTERN N 512 4096 1048576 16378 16324 0 16324 0 N FRA/
>>Why mounted disks are not appeared to create a database ?

$ crsctl check has
CRS-4638: Oracle High Availability Services is online
[grid@ausdev ~]$ crsctl check css
CRS-4529: Cluster Synchronization Services is online
[grid@ausdev ~]$ crsctl stat res
NAME=ora.DATA.dg
TYPE=ora.diskgroup.type
TARGET=ONLINE
STATE=ONLINE on ausdev
NAME=ora.FRA.dg
TYPE=ora.diskgroup.type
TARGET=ONLINE
STATE=ONLINE on ausdev
NAME=ora.LISTENER.lsnr
TYPE=ora.listener.type
TARGET=ONLINE
STATE=OFFLINE
NAME=ora.asm
TYPE=ora.asm.type
TARGET=ONLINE
STATE=ONLINE on ausdev
NAME=ora.cssd
TYPE=ora.cssd.type
TARGET=ONLINE
STATE=ONLINE on ausdev
NAME=ora.diskmon
TYPE=ora.diskmon.type
TARGET=OFFLINE
STATE=OFFLINE
NAME=ora.evmd
TYPE=ora.evm.type
TARGET=ONLINE
STATE=ONLINE on ausdev
NAME=ora.ons
TYPE=ora.ons.type
TARGET=OFFLINE
STATE=OFFLINE
[grid@ausdev ~]$ id
uid=501(grid) gid=500(oinstall) groups=500(oinstall),503(asmdba),504(asmoper),505(asmadmin)