Yes I beleive the 250MG drive does work, but I read that installing this drive will void your warranty....be careful....
There has been some discussion in here on that before....keep posting, there are some very knowlegable people in here who can help ytou more than me....
For what it's worth....Until I'm professionally recording and need so much time on one disc, I'm not changing anything...it works great and I'm keeping it that way....
I hope that you mean a 250MB ZIP drive, there is no connection for a 250MB harddrive. This is the only 'upgrade' for the BR-8, you cab find the details here http://www.olywa.net/blame/mwn/br8-250.htm