well since loosing all my recordings my humax has been very odd - one recording returned, using the buffer as chase play caused it to lock up pretty much everytime, then splitting a recording meant i couldn't watch the second section - it just came up with a message saying it was scrambled, (I'd backed up onto VHS already - I don't have DVDR yet), so, I have done it, re-formatted and given up on humax's "recovery tool" that will either never happen - or sods law be released next week. It seems more stable so far!!!
I was surprised that a re-format didn't erase my recording schedule list!