vishesh' reply is good if you are using LVM but it is not clear from your question that you are doing so.
What do you mean by "mount the internal hard drive volume in root account"?
Do you have only one internal hard drive volume?
Do you mean you will be root when mounting?
A volume must have a file system on it before it can be mounted.
In the simple case a volume is a hard disk partition. Is that your situation?
If you want the file system mounted each boot then you can add it to /etc/fstab.