Help - TechTool makes hard disk unreadable

After running TechTool's Volume Structure repair, my hard disk is now un-bootable and unreadable. Subsequent runs of TechTool state that the Volume Structure is OK, but Apple's Disk Utility says the volume is in need of repair and can't be repaired. Any idea why the difference between the two disk programs? And more important, how can I repair the disk?
Details: Mac G5 Dual 1.8G, OS 10.4.11 was apparently running OK until I did a routine scan of the disk with TechTool Deluxe (v 3.0.3) which I received from Apple with their AppleCare protection plan several years ago. It detected some unstated problem, and I chose the repair option. The analysis showed a few numbers in green and nothing in red (I recall seeing B-Tree depth was reduce and more free nodes). The Techtool repair appeared to go OK with no further messages. However, now the computer would not boot (gray screen with several languages almost immediately). I booted from my original OS10.4 disk and ran Apple's Disk Utility. It shows the volume is not mounted (grayed out). The "Verify Disk" says "Invalid B-tree node size" and "Volume Needs Repair". Running "Repair" quickly states the same plus "Volume check failed" and "Volume could not be repaired because of an error". Subsequent runs of TechTool says the volume is OK. How can one program say the volume is OK and the other say it's not? How can I recover?

You used too old of a version of TechTool. That version actually will ruin a Tiger install, especially 10.4.11.
Your only hope of repair will be by running the latest version, the 3.1.2 updater. Other utilities are usually unable to repair damage done by the wrong version of TechTool or TechToolPro.
Otherwise it's Erase and Install time. Let us know if you need help with that.
DALE

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Help - TechTool makes hard disk unreadable

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