Originally Posted by
saikee
If you work on the hard disk partition that is a privileged activity and the Admin right is needed. In Linux this is equivalent to be root user instead of an ordinary user. Old Linux allows a root user created during installation and a user can activate it at any time by command "su". Modern wants higher security and does away with it. To access commands with root privilege you need to prefix the command with "sudo" and the root privilege is granted temporary.
If you use privileged command but do not supply sudo in front you will see zero reponse.
I would advise you to post the output of "fdisk -l" here before committing to the resizing operation. Depending on the partition layout a resized hard disk may not boot again if you move its starting point. Remember in "fdisk -l" the last character is little "L".