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Error on oracleasm createdisk

Error:
oracle@localhost$ /etc/init.d/oracleasm createdisk DISCO1 /dev/sdb1
Marking disk "/dev/sdb1" as an ASM disk: asmtool:
Device "/dev/sdb1" is already labeled for ASM disk ""     [FAILED]

oracle@localhost$ /etc/init.d/oracleasm deletedisk DISCO1
Removing ASM disk "DISCO1"                                 [FAILED]

Solution:
oracle@localhost$ dd if=/dev/zero of=/dev/sdb1 bs=1024 count=100
100+0 records in
100+0 records out

oracle@localhost$ /etc/init.d/oracleasm createdisk DISCO1 /dev/sdb1
Marking disk "/dev/sdb1" as an ASM disk:                  [ OK ]
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