Hi, First post, so forgive me if I used the wrong forum. I have a new iMac and I bought an external drive, WD MyBook 2Tb (1Tb if in Raid 1) My reasoning was as follows: Put Snow Leopard and all the apps on the iMac and use the external drive as the Users drive. I know how to re-direct towards this drive. This gives me more space on my iMac and more security over my documents. Is there a reason why I should not do this? Thnx.