The 1TB internal drive on my Late-2009 2.8 i7 was completely full so I purchased a 2TB FW800 G-Drive to move all my data onto so my internal drive would only be used for system and therefore improve performance. However, I've just used the AJA system scanner to compare speeds and I get the following results: Internal Read/write - both around 125 MB/s G-Drive Read - 85 MB/s Write - 60 MB/s So now I'm concerned I'm actually decreasing performance considerably. The write speed of the external is less than half that of the internal and read speed 40 MB/s slower. Why is the write speed so low too? I thought they should be the same. I use my iMac mainly for music production and recording plus graphic and web design with adobe software etc. Wondering if I made the right choice... Am I going to find Logic/Pro Tools production and recording doesn't perform as well and using applications like Photoshop takes longer to open and save files? I guess I could have my current projects on the internal and then archive to the external when I've finished. I could then eventually replace the internal with an SSD What do you think?