DiskWarrior - Will it work, and when should I use it?

I apologize for this dumb question, but have no time to read 50 pages of the DiskWarrior manual.
Actually I have few questions, and hope someone will help. I got my iSight few days ago, and at the same time found in a shop here, in Beijing, DiskWarrior (which is not so easy to get in China). Being exited about getting the new machine, and having in my mind that I want it to work properly this time, I just bought it (and payed quite a lot for it 140 us$!!!) without giving it a good thought previously and mainly because everybody speaks about it as "the must" for every Mac, and now I feel stupid and need to ask:
1. this is a v. 3.0.3, (CD rev. 38) - will it boot from my iSight at all?
2. when actually do I use it, when I realize that there is a problem in my system, or should I use it as a maintenance program?
Thanks a million.
Zo

Hey Zorana. I too had your problem. Here is the text of an email I received from Alsoft, maker of DiskWarrior.
The DiskWarrior CD that you currently own contains DiskWarrior 3.0.3
which will work with Mac OS X 10.4.x (Tiger). However, whether or not a
DiskWarrior CD will start up a computer is based on the model of the
machine, not on the operating system that is installed on the internal drive.
In most cases, older DiskWarrior 3 CDs cannot start up newer machines
because they do not have the necessary System files. To start up the
iMac G5 (with built-in iSight) models that were released in October 2005,
you need a DiskWarrior CD with a more current operating system.
An Update CD (revision 39) with the latest startup System (Mac OS X
10.4.x "Tiger") and DiskWarrior 3.0.3 is available for order by calling
our Sales Department at 800-257-6381 (US Toll Free) or at 281-353-4090
(International). The cost for the Update CD is US$12.95 plus US$7.95
shipping & handling fees.
Finally, if you have purchased DiskWarrior in the last 30 days, we will
send you a CD for the price of shipping.
In the interim, you might utilize one of the following methods to run
DiskWarrior:
(1) Alternate Startup Disk: If you have another drive (such as an
external FireWire drive or an iPod with FireWire) you could install OS X
(the version which came with your computer, or newer) on that drive and
then start from it. Install DiskWarrior on that drive's "Utilities"
folder, (which is inside the "Applications" folder) and run DiskWarrior
from there.
(2) Target Disk Mode: Connect two Macs with a FireWire cable where the
one is the "host" and the other is a "target". The host Mac should be
running OS X (10.2.1 or higher). In this scenario, the target Mac is the
new iMac that cannot be started from the DiskWarrior CD. Start by
shutting down the target Mac. Then turn it on while holding down the "T"
key. The target Mac's drive will appear as a usable drive on the host
Mac. Run DiskWarrior from the host Mac and rebuild the target Mac's disk.
-- Marc
I hope this helps.

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