Mr C, thank you for your perceptive and valued response.
My experience reflects exactly what you suggest.
My ext3 partition now has every sign of being a useful part of my hard drive, and it may well have happened in part because I changed my approach.
Google, it seems, isn't everything.
I was so tired I looked around LQ, oblivious now to how self-indulgent it is to act out of generalised curiosity. Then, like any classic noob, I found an answer in another thread after having posted here.
Now my ext3 partition works even after a restart.
I hope it will tomorrow, too.
In the other thread, darin3200 described a twofold course of action:
Step 1)intervene manually on the mounting point folder
chmod -R 777 /hd
[I hadn't myself used the -R, and I'd been way, way discouraged when "sudo mount -a" just wiped the permissions & group to root every time I tried mounting the ext3 partition]
Step 2)"and now it works" says darin3200.
That spurred me on to stop this simulated reboot business with "sudo mount-a".
I closed everything down and restarted.
And, well, like darin3200 said: "now it works"!
The restart-driven fstab mount process has not, so far, reset permissions and group to root. I hardly dare believe it.
That LQ thread was called "User write permissions on ext3 partition"
http://www.linuxquestions.org/questi...tition-328413/
I was too narrowly focused on my "root only" problem to be searching for a "user write" solution.
So, I'm relieved to have what seems to be an ok ext3 partition, although lots more left to do.
Perhaps I could have got away with options of just default.
My ext3 partition's /etc/fstab entry is working *in spite* of containing every conceivable ext3 option. If I thought it had any value, I'd include it here, but I think my good fortune was solely due to the conclusion summarised in the "User write permissions on ext3 partition" thread.
I hope the original poster here, Streams &dragonflies, has had a similarly happy result, and thanks for the moral support Mr. C.
Thanks for the time and space, LQ