How to transfer everything from one hard disk to another

[arecibo777]

How can I transfer everything from one hard disk to another in the same PC?

 

[mosh112]

How can I transfer everything from one hard disk to another in the same PC?

Depends.
How are the hard disks connected? IDE controller? USB?
And what is "everything"? System and data? Or just data?
Is your objective to have a duplicate bootable drive, or just to have a data backup?