adding a disk using blockdevice

Hello,

I did fdisk /dev/sdf

It created /dev/sdf1

Now In ASM it shows both /dev/sdf and /dev/sdf1 as candidate disks

select header_status,mount_status,name,path from v$asm_disk;

CANDIDATE	CLOSED				/dev/sdf
CANDIDATE	CLOSED				/dev/sdf1

Can I use both these in adding the diskgroup ? Since these 2 are same I mean would this be a situation that if I create 2 dgs from these 2 name /dev/sdf and /dev/sdf1 then the space would exhaused with combination from both.Please help me understand.

Best regards,

Vishal