Disk Drive problems on MacBook

I'm having problems on the internal drive in a MacBook Pro - it appears to be getting "Read I/O Errors" according to the Console Messages log. I booted from another external USB drive that has OS X 10.5.4 on it and I tried to use Disk Utility to repair the internal drive but it fails in the ""checking catalog file" phase and gets either an "invalid node structure" or "invalid key length" error, so am guessing the catalog file has been corrupted due to a hard drive error.
So, I tried to use DiskWarrior and it also failed to rebuild the internal drive, but it was able to create a volume in "Preview" mode, which is a read-only version of what was able to be reconstructed ( guess). I am guessing that DW built a new version of the catalog file that did not contain any references to the bad spots on the disk, but not sure what it really did to get the read-only volume back to a state that it could mount this read-only volume and things could be backed up. Can anyone describe what DW really does in this kind of situation? I also noticed that the physical name of the device associated with this "rebuilt read-only volume" has a different value than the real drive (in this case real drive was referred to as /dev/disk0s2, but the DW volume was mounted as a /dev/disk4). How does the filesystem name get changed like this?
So, my main question is that knowing the blocks that had the "Read I/O errors" (the block numbers are in the Console logs), is there a way to tell in which file(s) the error actually occured? This would help me decide on what parts of the drive that DW was able to rebuild are missing or some other issue, and if it's some important system file, it would probably be better to install a new system and go thru "Software Update" rather than restore from the copy of the DW rebuilt read-only version that I made.
Thanks...
-Bob

"...This has got me back to 694 MB available on the HDD...."
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