What kind of format is best for OSX?

I just bought a new iMac loaded with OSX Tiger. I have an existing external hard drive which I used from my PC machine and I want to use it in my iMac. Which format do I format the disc into? There are so many options and I'm unsure which is the best. OSX Extended, OSX Extended (Journaled), etc, what is the difference of these formats in terms of usage?
I would appreciate some help.:)

The default file format OS X Extended Journaled is the most common one to use. It provides support for OS X file system, as well as supporting file journalling, which can help restore files that may become damaged if the computer should freeze, or shutdown unexpectedly. Journalling keeps a list of files that have pending modifications to be made, but have not yet had the data written to the disk. Should your iMac freeze up on you, then the next time you start the iMac up, it checks the current state of the hard drive against the journaled list. If a file didn't finish being updated, the iMac completes the needed updates to the file system.
The disadvantage to journaled file systems, is that they are slightly slower then non journaled counter parts, however, they have an advantage when it comes to protecting data integrity of your hard drives.
Journaled file systems have another slight disadvantage, they tend to be more difficult to repair when a major drive failure or corruption occurs. However, this should be a non issue, since you should not be relying on data recovery utilities for major problem, but should instead have adequate backups in place.
Tom N.

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