Formatting external HD for older computer

I had a PC formatted hard drive that I reformatted for Macintosh, to give to a friend of mine. She has an older mac than I. I have a macbook 10.5.6, and she has a G3 laptop with 10.2 (I think it's 10.2, but it could be 10.3). It is a small hard drive and runs on a USB cable.
After I formatted it, it ran fine on my computer, and I even copied some pictures on it for her.
But the hard drive won't mount on her desktop. It runs, it has power, it has a power light, but she can't access it. She can't even see it with Disk Utility.
Did I use the wrong option to format it? I used Disk Utility, and it gave me options, like Mac OS Extended (Journaled) (whatever that is), and other options I forget now. I chose the plainest one, and I forget what it was called, because I can't see the list of options now that I don't have an external hard drive attached.
But, in anyone's opinion, if I reformat it using another option, will it work? Thanks for your suggestions.

There are two things to consider:
The partition scheme (APC for PPC; GUID for Intel)
You probably used GUID which won't work on an older PPC computer.
I am not sure about the formatting. HFS+ may be too new for a G3 running 10.2
I would do this:
Have your friend format and partition the drive pn her machine, and then you take it back and if you can see it and access it normally, copy the file onto it and that should work.

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