Cannot drop asm disk


select header_status, path, name from v$asm_disk;

HEADER_STATUS PATH                           NAME
------------                ------------------------------ --------------------
MEMBER             /dev/rdsk/c6t4d0s6
MEMBER             /dev/rdsk/c5t1d0s6             DATA_0000
MEMBER             /dev/rdsk/c5t1d2s6             ORAFLASH_0000

Notice that /dev/rdsk/c6t4d0s6 does not have a name.

Question is, how do I drop this disk from the diskgroup?

I cannot use
alter diskgroup data drop disk '/dev/rdsk/c6t4d0s6';

That is incorrect syntax. I need the name.

Any ideas?

PS: I tried (guessed) with name data_0001 but it gives error saying
data_0001 not part of diskgroup DATA.


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