I too use TI 8 as far as I'm aware disc clone is used if you want to install a new hard drive in your pc, a larger drive for example. Using disc clone you can set up the new disc for use and let TI create partitions on the new drive, or in the manual mode resize these partitions. I've not used that feature myself, only used the prog to create images for backup purposes. I'm not sure if you could use a backup image to set up a new hard drive in your pc, though I would hope that is an option if the original drive were to fail. Then again installing a new drive is an ideal opportunity to re-install your OS afresh!