Hi ... I'm a complete newbie and I have a simply question. Is it possible to enlarge the recording capacity of my DirecTV 40GB unit by connecting a USB hard drive? If it is, are there any steps I must take to do it and is there any additional equipment that I need? Also, can anyone make a recommendation on what type of hard drive to use? (all my computer equipment is Mac, but I'm assuming that I'd need to use a PC-type hard drive). Any help would be greatly appreciated! So, thanks in advance!