Which tool best for problem checking

guys, which tool, free or not is the best solution to use to check the system/harddrive for problems?

Like Steve says, you should always start out with Disk Utility. It comes with the computer. Another utility that comes with the computer is the Apple Hardware Test (AHT). It's very good for diagnosing hardware problems. However, its messages aren't necessarily the most helpful. However, if the AHT flags an error, it's a good idea to have the computer looked at by an Apple technician.
Two other utilities that aren't free are TechTool Pro and Alsoft's DiskWarrior. However, DiskWarrior is currently not compatible with Intel-based Macs. Its focus is mainly on rebuilding the disk directory, the catalog of which files you have and where they are on your drive. DiskWarrior can often fix problems that Disk Utility can't.
TechTool Pro, on the other hand, is a more comprehensive diagnostic tool. It can check your main memory, ports, etc. One important hard drive test it can do is a surface scan, where it tries every sector on your disk, looking for bad blocks. While the Apple Hardware Test does some of the same tests (memory, processor, etc.), TechTool Pro's results are generally more informative than those from the AHT. For example, you can get a detailed summary of your hard drive's S.M.A.R.T. attributes.
I'll also mention smartmontools, a command-line tool to check and monitor the S.M.A.R.T. system in your drive. This one's for real geeks, though, as you need to download the source code and compile it yourself. However, it also prints out very detailed reports on the status of your drive.
Finally, though these tools are pretty good to have around, they're no substitute for a good backup, either of your data, or your whole system. Sometimes drives just fail without warning, and none of the software would help. That's when having a recent backup is crucial. I'm a big fan of Shirt Pocket's Super Duper!. It makes backing up pretty painless, and has saved me from major heartache a couple of times.
Another drive cloning program is Mike Bombich's Carbon Copy Cloner. It's quite usable, and it's donationware, so the price can be cheaper than Super Duper!, but it's also a bit more difficult to use, especially in making partial backups.
charlie

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