And yet another update :

I've tried this again : I've powered down the Empeg and let it cool off for 3hrs. When I turned it back on, I could use Emplode and upload files to it like it was supposed to work.

After +/- 30 files, the machine became gradually slower, until it timed out with the by now well known error.

So this whole problem seems like a heat problem. Is this possible? Is this a first? And what's overheating here? The electronics on the motherboad of the empeg, or the added IBM drive?
Also, keep in mind that the Empeg does keeps on working perfectly : it still plays mp3's great, it's just the adding of files that gets screwed up.

I did not do anything special to it when I added the second drive. Just inserted it and closed the empeg up again. I'm sure I didn't damage anything, I was way too careful for that.
Also, there is certainly nothing blocking airflow.
I can't understand why this is happening

Riocar 58gig (48gig + 10gig IBM travelstar) S/N : 10101747 red