dd permissions with live cd

[OpinionatedDrone]

I am trying to copy a .img backup file of my hard drive using knoppix live cd, however, every time I try to us the dd command, I get an "Access Denied" message. I have tried changing the permissions of the drive, as in the FAQ, however, this does not seem to have an effect.

since it is the entire HDD image, I would like to dump the data (dd) to a raw 'hdb' rather than a partition 'hdb1'. I don't care if I erase the current content of the drive.

Here are my latest tries in Konsole:

knoppix@1[sdb1]$ dd if=./backup.img of=/dev/hdb
dd: opening '/dev/hdb' : Permission denied

And:

knoppix@1[sdb1]$ dd if=./backup.img of=/dev/hdb1
dd: opening '/dev/hdb1' : Permission denied

[malaire]

I am trying to copy a .img backup file of my hard drive using knoppix live cd, however, every time I try to us the dd command, I get an "Access Denied" message. I have tried changing the permissions of the drive, as in the FAQ, however, this does not seem to have an effect.

since it is the entire HDD image, I would like to dump the data (dd) to a raw 'hdb' rather than a partition 'hdb1'. I don't care if I erase the current content of the drive.

Here are my latest tries in Konsole:

knoppix@1[sdb1]$ dd if=./backup.img of=/dev/hdb
dd: opening '/dev/hdb' : Permission denied

And:

knoppix@1[sdb1]$ dd if=./backup.img of=/dev/hdb1
dd: opening '/dev/hdb1' : Permission denied

Try adding sudo before the command, i.e. sudo dd if=./backup.img of=/dev/hdb