Hey folks, My iMac previously had Windows 7 on it, and never caused a problem. For reasons too long and boring to recount, I had to remove it and revert solely to OS X for a while; and today I decided to put it back on. Boot Camp Assistant starts as it should, it asks me to apportion the space (I select one third OS X, two thirds Windows) then I click 'Partition'. It beavers away for a while, the blue bar builds up and up, but when it gets to about 60% of the way along it stops. The drive no longer ticks - the computer doesn't appear to be doing anything - and two or three hours later, it's still no further along. I don't know how Macs write to their hard drives but, if it's in a linear and sequential fashion, there shouldn't be anything on that drive beyond the first 200GB. It should be completely clear above that, so I don't see how it could be defragmenting or anything. To invert Steve's favourite phrase, it just doesn't work... ... any ideas? Cheers, DH.