Not reading WD 750 external hard drive

I have a WD external hard drive, it first disappeared and my computer would not find at all. I switched from firewire to usb and I was able to find it but it needed repair. I ran Disk Utility and got the following message:
Verify and Repair volume “750GB 1”
Checking Journaled HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Incorrect size for file iNode51191264
(It should be 0 instead of 288230376151711744)
Invalid key length
Volume check failed.
Error: Filesystem verify or repair failed.
How do I find the iNode to change the number to 0?
Thanks

Any one that supports booting Macs and doesn't have built-in software that can't be removed or disabled (WD's SmartWare isn't one of those). Seagate (including Maxtor), LaCie, and Hitachi, come to mind. Usually, I roll my own. This is the latest one, done last April:
Macally GS350SUAB Hi-Speed eSATA/1394A/1394B/USB2.0 Storage Enclosure for 3.5inch SATA HDD
w/Hitachi 1 TB Deskstar SATA 7200 RPM 32 MB Cache Internal Hard Drive HD31000 IDK/7K

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Not reading WD 750 external hard drive

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