5d mark ii owner getting ready to play with my new toy. I have an iMac intel core duo computer and love it. I need advice on external harddrives that work well with this computer. I just bought the "My Book" 1 T from western Digital and the disk never appeared on my desktop. I read reviews on Amazon and see that this has been common. I know I will need a large external drive with this 21 megapixel camera and I would like to know what external harddrives you are using to back up your files. I would also like to know if anyone out there knows what software I will need to use in order to edit my images as I am not sure if Aperture (which I currently use with my xti) is compatible with the 5d mark ii. Any help or suggestions are greatly appreciated. Thanks.