I'll be installing Windows 7 64-bit Home Premium through Boot Camp, and then link such partition to Parallels. It will be for a 2011 27"iMac which has a 1TB hard drive. I'll be using the partition for gaming (not too heavy) and some databases. What would be a good hard drive size then? I was thinking about 300GB-350GB, is that a good amount? I understand the partition can't be re-sized once it's been made. What size have you given to your partition?