Erase RAID metadata from (previously used) disk.

Find the below simple steps.

• If your disk has RAID metadata that it is impossible to erase with common ways but you'd like to erase it to use the disk with no RAID. 

• Then attach the disk to another mashine that Linux is installed and boot it first. 

• Next erase RAID metadata with the following way.

[1]Install mdadm to verify disks.

[root@test ~]#  yum -y install mdadm dmraid

[2]If your disk has RAID metadata, following result is shown. 

The example below, it shows there is RAID metadata at 124914352 sector on /dev/sdb.

[root@test ~]#  dmraid -r  /dev/sdb: ddf1, ".ddf1_disks", GROUP, ok, 124914352 sectors, data@ 0

[3]Erase RAID metadata with mdadm like follows.

[root@test ~]#  mdadm --zero-superblock /dev/sdb  [root@test ~]#  dmraid -r  no raid disks and with names: "/dev/sdb"

[4]If it's impossible to erase with the way of [3], 

overwrite with dd command like follows.

[root@test ~]#  dd if=/dev/zero of=/dev/sdb bs=512 seek=124914352  [root@test ~]#  dmraid -r  no raid disks and with names: "/dev/sdb"