1 PB= 1024TB = 1 048 576 GB
or 512 2TB disks (actually, closer to 565 if you want 1PB of usable space at 1.819TB of actual space on a 2TB drive)
Eitherway, you cannot be serious. Anyone with that type of storage needs would not be asking on Tom's...
Although I do recall seeing an article about a 1.2PB drive, maybe someone less lazy than me can google it.