How to copy as many files as possible off a partially damaged HD?

I've got an external HD attached to my machine. The external HD was an internal one of another machine (which was running OS X 10.6.x) but there's something wrong with it (the other machine failed to start up with it). It mounts on my machine fine. I started off trying to make a disk image using Disk Utiltiy. It started off fine, then got so far and said, I forget exactly, but along the lines of read error, or I/O error. So I guess one part (or several parts) of the drive is damaged while other parts are fine.
How can I copy what files are readable to another drive, short of doing them manually/individually?
Thanks.

Other than copying them individually, the only option would be to try one of the various file recovery utilities such as Data Rescue (Prosoft Engineering), or File Salvage (SubRosaSoft). No guarantees that even those will be able to recover files from a failing hard drive, but they might be able to get at least some of the data. The only other option would be to send the drive to a data recovery service, and those are very expensive.
Regards.

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