How do I duplicate a server harddrive?
 

Hello. My friend has a server, and he thinks the harddrive in it is starting to kick the bucket. I was thinking that we could use cat or dd to make an exact copy onto another harddrive. Is this possible and if so how? Also, I he thinks there are some bad blocks on the harddrive, therefor would we have to use dd_rescue? Any help will be greatly appreciated.

You could use dd:
dd if=/dev/hda of=/dev/hdc

Assuming you want to copy hda to hdc. Partimage may be better if the new drive is a different size/