I recently invested in a Mac Pro after migrating from a PC. I bought it for the specific purpose of image editing,so would like to optimise it for working in Photoshop CS5 and Lightroom. I am however, unsure of the best arrangement. Other than to add additional hard drives, I have yet to use the Mac at all, so it remains as it arrived from Apple, i.e. PS and Lightroom yet to be installed. I thought this would be a good starting point for configuring it. My hardware set-up is as follows: 2.66GHz 8 Core Mac Pro, 8 GB RAM, ATI Radeon HD 4870 graphics card, 1 TB hard drive. I have since added three more 2 TB hard drives. My image library currently resides on an external 1 TB hard drive, which is backed up on a second external drive. I was considering moving the library over to one of the 2 TB drives, if only for neatness and convenience. My all encompassing question is, what arrangement should I be going for, bearing in mind that there needs to be a backup strategy? Additionally, what about partitioning one of the drives for scratch? Which drive and how much of it? Should PS and Lightroom be installed on hard drive 1 (the start up disc)? It will be obvious by now that my computer literacy is minimal, so I'd be grateful for any advice to be in simple language. I'm sure someone will recommend the diglloyd site which I have already done. It certainly does have a wealth of information on the subject, but a lot of it was too technical for me. Reading it sent my head into a spin. Thanks in advance.