I have just bought a new Ipod nano and and currently using it on my mums pc but when i get my iMac I want to be able to plug my ipod in on it but it says format windows.. so would i be able to like reset it and put it on my iMac?
Your Mac should be able to read your PC-formatted iPod just fine. The only catch is that I believe any iPod software updates would have to be done on a PC. Probably the best thing to do is just use your iPod in disk mode to bring your music over to the Mac, then reformat the iPod in Mac format. (Assuming you don't need to connect it to a PC anymore...)