Seagate plans 300TB hard drive by 2010
 

PLATTER SPINNER Seagate thinks that it will be able to create a 300 TB hard-drive by 2010. According to Joystick, Seagate boffins are apparently working on a hard-drive which uses heat-assisted magnetic recording (HAMR) techniques. The boffins think that this will mean that they can shove 50TB of data into a single square inch of drive space, or around 300TB of information on a standard 3.5-inch drive.

http://www.theinquirer.net/default.aspx?article=36675

300.000Gb on one disk, better run these in RAID 1, in case things go wrong ;)