I'm mainly a video guy, but I also do Photoshop stuff, either for the videos or just for fun. I haven't set Photoshop to use my external drive as a scratch disk though, I'm wondering if it's all that necessary with Photoshop? And considering my specs? I have a 2012 iMac: 3.1GHz i7 16GB RAM GeForce 650M 512MB 1TB Fusion Drive Adobe Production Premium CS5.5 As it is, it turns out that I have enough RAM that I don't need a faster hard drive to encode video. I tested it between my FW800 G-Drive 1TB against a LaCie 240GB SSD Thunderbolt RAID, and they both render at the exact same speed.