Hi,
Thanks for your warm support.
The first hard drive I tested was already formatted and WB-installed, as it was in the state the former owner used it, and I had successfully tested this drive at his house. The first time I used the computer after the buying, it didn't crash either : I could read and write a few files, even LHA some of them, without a problem, except that I noticed the floppy drive was broken (I now test the computer with and without a spare non-A3000 internal drive). But at the second test the hard drive jammed the computer (in the same way as the other drives I tested afterwards), although I didn't change anything to that drive except trying to read and write files as I did during the first test.
"The controller's configuration is stored in a NVRAM powered by the same battery which the clock is."
That's the quote I started my thread with, although it didn't came from the same source. Which "setbatt.lha" are you referring to ? The docs of the two SetBatt I find on Aminet don't contain this phrase.
Powering the hard drive with a PC is what I intented to do today, but as I'm lacking space at the moment, I will test that later.
I may be able to prepare another drive if necessary, as I have an SCSI A4000 that should work - you may meet this Amiga in another of my "Needing help" threads...
And I haven't performed all the tests that were suggested in this thread, so except technical and tinkering skills (I am just a passionate Amiga user hating electronics !) I am not running out of ressources yet.