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I want to wipe hard disk which is behind the raid controller. I am able to break the raid. After that, i m getting /dev/sg2 not /dev/sda like.

# lsscsi -g
[1:1:0:0]  disk  Hitachi HDxxxx  jp40  ---   /dev/sg2   
[1:1:1:0]  disk  SAMSUNG HDxxxx  1AA0  ---   /dev/sg3

so i have to write this using /dev/sg2 handle. so what is the way to wipe the disk using /dev/sg2 handle.

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Use dd:

dd if=/dev/zero of=/dev/sg2 bs=1M

More secure with random bytes:

dd if=/dev/urandom of=/dev/sg2 bs=1M
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  • thnks for the reply. that's ok i can erase that one, but a problem is occurring that in LSI raid contoller it is showing only one that is /dev/sg0 .like # lsscsi -g [0:0:27:0] enclosu LSI Corp SAS... 0717 --- dev/sg0 in it there are 2 disk and it is not showing disk individually so how to wipe these disks individually. – Ashish Gahlaut Dec 15 '16 at 9:32
  • after running this (dd if=/dev/zero of=/dev/sg2 bs=1M) command, i m getting error # dd if=/dev/zero of=/dev/sg2 bs=1M dd: error writing '/dev/sg2': Invalid argument 1+0 records in 0+0 records out 0 bytes copied, 0.00156275 s, 0.0 kB/s – Ashish Gahlaut Dec 15 '16 at 10:31

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