Thanks for all the posters, fellow contributors (I know some of you from mindisc.org already ...) The suggestion about region may have some merit, but as I run three different computers (actually the 3.2 I referred to and the 4.0CP giving the error message are on the same physical machine but dual-booted with W98SE and WinXP Pro) and I have a mixture of downloads from the internet via links on minidisc.org and the standalone downloader from that same source, I am not too sure which region/version is what (is there a good way to tell?) Although the HD3 is less than 5% full, I am NOT going to reformat yet, as it would seem to be unnecessary as it works fine with 3.2, although I know for sure that some of the material was ripped from my laptop, which was running 3.4. When the laptop comes home from work I will see if it works with the HD3, and as it has since been upgraded to 4.0CP from 3.4 via the same route as my XP desktop machine, the result will be of interest. BTW I spotted the posting on the "4.0 bugs" thread after I posted my problem, sorry about that. I'll post here any progress I happen to make, if any. Thanks again [P.S. I guess there are technical people from Sony who monitor this forum for feedback on problems with their products ...]