After trying several times to rebuild my Directory with DiskWarrior 3 (DW3) and receiving an error each time, warning me that an error had occured and I should back up my files...., I tried TechTool Pro 4 (TTP4).

TTP4 ran every test without so much as a raised eyebrow. It then repaired the Directory with ease.

Just to be sure that no tricks were being played (various utilities use different methods of addressing various problems and one method may report an error that a different method will not), I then tried DW3 as a double-check to see if the error was indeed gone.....it was.

Conclusion: TTP4 repaired a Directory that DW3 could not. It also addressed and corrected whatever problem was causing DW3 to get an error.

All repairs were performed while booted from CD with both DiskWarrior 3 and TechTool Pro 4----NOTE: I've seen some comments about the lengthly boot up time from CD. This is due to the need of OS X to establish a ram disk for scratch purposes and is not due to any utility being poorly coded. Both DW3 and TTP4 take a very long time to boot because that is what OS X requires at this time. Perhaps in the future, coding will be created that corrects this.

In the meantime, don't penalize a utility for an OS requirement.

TechTool Pro 4 is a full featured repair utility that is a "must-have" for anyone that is serious about keeping their system in proper repair or has a system in need of repair without data loss. While no single repair utility is capable of handling every possible problem in every possible case, TTP4 is the a utility most likely to be capable of handling the problems you'll most likely encounter and many of the ones you'd never dream of having.

If your budget limits you to only one heavy duty repair utility, TechTool Pro 4 is a good investment.

LM