[AppleGirl1990]

Looking to fix general errors/permissions that might exist on my hard drive.

Three names come to mind:
1. Disk Warrior
2. Drive Genus
3. TechTool Pro

In your opinion, which is the best and why? I had Disk Warrior, but it no longer works with my computer because it's too new for its software. I thought they would have released a patch (since the incompatibility happened back in January 08), but nothing has been updated....so i'm looking for something new.

[Big Mac]

Disk Warrior has been shown to be the best disk utility by an analysis of Mac disk utilities I read a couple of years ago. It does the most amount of good in repairing things and the least amount of harm by not guessing when it can't properly repair damage. Disk Warrior saved a drive in my clamshell iBook that a bad OS 9 installer corrupted enough that the system at first couldn't even mount it. I am a bit concerned that they haven't updated Disk Warrior to support booting 2008 Macs, but I think it will still work properly from another start up drive.

Drive Genius I don't know too much about. It seems to be a pretty solid product and may be what you're looking for if your concern is file repair; it also does file defragmentation (whereas Disk Warrior only does directory defragmentation). TechTool isn't a bad suite but has more flash than substance; I don't think it does very much as far as drive repair goes but can perform a surface scan to inform you of bad sectors (which Drive Genius can also do).

[OreoCookie]

There is also Data Rescue, but it's a data recovery tool, not a repair tool. It works a lot better than Disk Warrior, but that's mostly because Disk Warrior potentially more dangerous things.

[64stang06]

For repair, Disk Warrior is still the best. TechTool has a habit, on my machines at least, to do worse damage than what I had before. Or just nothing at all.