About an hour ago I almost had my post completed but I decided to use Disk Utility to grab/verify some info and discovered that I was not able to see the size of the device from there, so I took it out for inspecting it with my own eyes (yes, without unmounting it first), so I received a friendly reminder from OS X.
It didn't show any useful info so I decided to swap the micro-sdcards and... 'voila': you saved my day (for the moment), I thought all the time I was using the smaller sdcard but I was wrong. It was the 2 GB one all the time.
So I inserted the adapter with the smaller one and it was recognized immediately. Then I tried to view some info from the card with the Disk Utility for sharing precise info with you but the laptop showed me that spectrum-like disc rotating clockwise but it never stopped. I needed to try to kill the app but something that I pressed rendered me a black background screen with some menu: Movies, Music, etc.; I don't know what I did for that to appear but I was unable to stop that app or getting out of it. I needed to press the POWER BUTTON for a few seconds to halt everything. After rebooting I noticed that the folder for the sdcard was now empty, while before it had about 50 files in there. Re-tried that Disk Utility & everything reproduced as before, so back to the Power Button...
This time I took out the sdcard adapter and restarted, then inserted the adapter back and, apparently, all the files are still there... Think this time I was lucky.
Now, to rewrite what was lost... BTW, do this forum grabs a copy of what the user is writing as she/he goes on?
Sorry for maybe introducing confusion into the discussion, in my last post I pretended to refer to both cards when I mentioned that I had used them both with various laptops without any issue. In fact, both were formatted and some files introduced in more than one laptop. The app for partitioning/formatting them was gParted.
Now that I have had some minutes to think about it, if I can install in this iBook something like Virtual Box, install & run a linux OS would it mean that the OS is also capable of booting/running the iBook or these are not necessarily implied?