rjhythloday,

Welcome to Justlinux.

The easiest is to follow Post #1 of this thread.

My reply to MKIII_Supra also work but is slightly more involved. The basic difference is

dd copies binary bits of "1" and "0" of the hard disk. You therefore clone the 80Gb hdd partition table onto the new 750Gb disk. It will boot exactly as the 80Gb because the boot sector is also duplicated. You get an exact clone. The remainder of the 750Gb become unallocated hard disk space. You can create additional partition with the unallocated space or run "gparted" or "Parted Magic" live CD to resize the existing partitions to absorb the unallocated space. The choice is youre.

If you use file copying command, like tar as I recommended to MKIII_Supra, only the files are copied and not the partition table or the boot sector. Therefore you need to restore the boot loader which is a simple matter. This solution does allow you to choose a destination partition of any size without the need of resizing.

All the information is contained in Post #1 which is the "Howto". The other posts, like the present one are queries and answers.

Please feel free to raise questions. You will find a lot of willing helpers here.

I normally offer too much information as I try to explain the steps. The actual cloning operation is dead simple.