My brother says the max hard drive size on Windows XP is 2TB and that if I want to use 3TB drives I hafta switch to Windows 7. Is that true?
the easy answer is yes,move to w7 to avoid any issues and be at ease.
It can be done in XP (by using larger sectors) but sooner or later you will get hit by a rogue program that damages the file-system.
Tom UK