Terminal Help Needed

I have a powerbook hard drive with hardware issues. The drive mounts with no problem via an external usb connection to my MacBook Pro but I cannot navigate the drive without hanging the Finder. I want to use ddrescue to copy the drive contents to a drive image. My unix commands are basically non existent and I need help figuring out how to put the correct commands into the Terminal App.

Here are the locations of each piece of the puzzle.
ddrescue is located at the root of my MacBook Pro drive named ddrescue and the drive name is Macintosh HD
the bad drive is Disk1s9
The drive I am copying to is called Rescue

The directions...best I could find were:
Example 1: Rescue an ext2 partition in /dev/hda2 to /dev/hdb2
ddrescue -r3 /dev/hda2 /dev/hdb2 logfile (running ddrescue)
e2fsck -v -f /dev/hdb2 (checking resulting dmg.
mount -t ext2 -o ro /dev/hdb2 /mnt (mounting resulting dmg.)

Is this the correct info?

sudo ddrescue -r3 /dev/disk1s9 /Volumes/Rescue/SaveKeith.dmg savekeith.log

This all makes me nervous since I get the warning when I use sudo.

 

neither works..I've tried data rescue II as well....it just got worse. now the drive won't mount at all.

 

so far the only manual I have found states what I listed about. The rest I have gleaned from othe posts.
/Volumes/Rescue/SaveKeith would be the path for the other usb drive correct?

Got this from another post but so far it doesn't seem to be doing anything
su - root
cd/
./ddrescue -v /dev/disk1 /Volumes/Rescue/SaveKeith savekeith.log

Here is the info I found on running it on osx
http://www.macosxhints.com/article.php?story=20050720092514388

 

Update...got it working
First, I had to enable the root user.
Second I used the following: sudo /ddrescue -v /dev/disk1 /Volumes/Rescue/SaveKeith.dmg SaveKeith.log

Not sure how long it will take but so far it has only had 4 errors