Device "/dev/sdb1" is already labeled for ASM disk "CRS1"

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[root@srv1 ~]# oracleasm createdisk CRS1 /dev/sdb1
Device "/dev/sdb1" is already labeled for ASM disk "CRS1"
[root@srv1 ~]# oracleasm listdisks
[root@srv1 ~]# oracleasm listdisks
[root@srv1 ~]# oracleasm createdisk CRS2 /dev/sdc1
Device "/dev/sdc1" is already labeled for ASM disk "CRS2"
[root@srv1 ~]# oracleasm createdisk CRSDATA1 /dev/sdb1
Device "/dev/sdb1" is already labeled for ASM disk "CRS1"
[root@srv1 ~]# dd if=/dev/zero of=/dev/sdb1 bs=1024 count=100
100+0 records in
100+0 records out
102400 bytes (102 kB) copied, 0.00149722 s, 68.4 MB/s
[root@srv1 ~]# oracleasm createdisk CRS1 /dev/sdb1
Writing disk header: done
Instantiating disk: done
[root@srv1 ~]# dd if=/dev/zero of=/dev/sdc1 bs=1024 count=100
100+0 records in
100+0 records out
102400 bytes (102 kB) copied, 0.00150767 s, 67.9 MB/s
[root@srv1 ~]# dd if=/dev/zero of=/dev/sdd1 bs=1024 count=100
100+0 records in
100+0 records out
102400 bytes (102 kB) copied, 0.00158146 s, 64.8 MB/s
[root@srv1 ~]# dd if=/dev/zero of=/dev/sde1 bs=1024 count=100
100+0 records in
100+0 records out
102400 bytes (102 kB) copied, 0.00163386 s, 62.7 MB/s
[root@srv1 ~]# dd if=/dev/zero of=/dev/sdf1 bs=1024 count=100
100+0 records in
100+0 records out
102400 bytes (102 kB) copied, 0.00152457 s, 67.2 MB/s
[root@srv1 ~]# dd if=/dev/zero of=/dev/sdd1 bs=1024 count=100