I thought this was a USB connected device (I am looking at 1T - two 500MB drives mirrored). I have read that if using large file formats (yes - RAW) perhaps the way to go is something like Sonnet Temp SATA Express 34. There is a lot of 'talk' of Western Digital My Book but these only seem to be USB. Now I am a little confused - am I restricted (device wise) if I go Express 34 as it appears to have a specific I/F? I do not have a limitless budget and have seen external storage devices between £50 - £100. On a winXP machine it seems almost any will do but I'm not familiar with the mac world. Any advice would be most appreciated to a mac newbie!