cement - welcome to my real area of expertise - running repair and optimization programs
here's my opinion on them (having used them all) -
the best is diskwarrior at
www.alsoft.com . it is a simple, fast, repair program that is safe to use - won't destroy everything if a power outage hits in the middle of it. The best deal is to order the cd and get Plus Optimizer along with it. this is a defragging app and again - it is fast, simple and safe. well, at least as fast as a
good defragger can be.
next best is TechTool Pro from
www.micromat.com . It is a bit more complex, considerably slower, but also safe. It has repair and defragging all in one app. It also has certain restricitions that hang it up at times - like not being able to complete a defrag if you have a file larger than biggest unused block. But if you like to know each detail of what it is doing, to control what tests you want to run, and to get a more detailed report of progress and results - then you might like this one better. I think the speed issue is the reason i don't use it more often.
both of these apps are curently only able to run in os 9 (not even classic and must be launched from and alternate boot disk like cd or external drive. but they do complete repairs on os x.
the only x native repair utility is Drive 10, also from alsoft, which works pretty well, at least for me. i have heard people complain about it, but not me. It is reasonably fast and safe, but must run from a seperate disk as well. nice, but at this point still not worth the investment in my opinion.
then there is norton from symantec. no link here because i tend to try and avoid lawsuits for handing out bad advice
It's only advantage is speed. it is completely unsafe - having a reputation for taking down drives even without a power outage. It will also tell you something is fixed and then tell you the same thing is wrong again on a second examination right afterwards. always laugh to yourself when anybody claims that the other apps don't work and they know because norton found all these problems that no others would. (and people say this all the time!!!) honestly, avoid ths one like the plague.
I will only say that Diskwarrior saved one of my drives a while back that none of the others would. in fact, that was when i bought it and it has been my first choice ever since. and i can defrag an 80 gb drive in just a little longer than a good night's sleep with plus optimizer. and sleep soundly while i am doing it.