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Sfdisk: cannot open /dev/sdb read-write

The following command which worked on a Scientific Linux server did not work on a Ubuntu server.

sfdisk -d /dev/sda | sfdisk --force /dev/sdb

Here is the error I received.

sudo sfdisk -d /dev/sdb | sfdisk --force /dev/sdc
         /dev/sdc: Permission denied

	sfdisk: cannot open /dev/sdc read-write

Even with Sudo the command refused to do what I expected. After a quick Google search I found the following which simply suggested to double the Sudo command which if you think about it makes sense.

sudo sfdisk -d /dev/sdb | sudo sfdisk --force /dev/sdc

Now I feel stupid, BTW I was creating a RAID 10 array.


  1. Commented on
    Comment by Dean

    Thank you.

  2. Commented on
    Comment by gabtrek

    Thanks a lot for this “double the sudo” part 😮

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