• The first, the C drive, will be the system drive which will hold Windows should be as fast as you can possibly get it.  I recommend a 10k rpm raptor.  These are pretty expensive (close to $200) and top off at 120gb or so.
• The second, the D drive, will be a nice big 500gb or larger scratch drive and backup drive.  You can use this for storing lots of backups, temp space, etc.  Just get a normal 7200rpm drive here.
• The the third, the E drive, is for your data.  Make your own MyDocuments folder here and store your own data files here.  Use a fast 10k rpm raptor 120gb if you like, or a normal 7200rpm drive.

• Having a large backup drive in the pc, independent of both the windows system drive and your data drive, is wonderful.  Makes it so easy to backup and restore quickly and gives you plenty of space to do so.  Also gives you great space for any temporary stuff.
• Upgrading to a 10k rpm superfast C drive which holds windows and your program files, feels like buying a new computer.  the speed difference is remarkable.

Boeing's new 787 Dreamliner passenger jet may have a serious security vulnerability in its onboard computer networks that could allow passengers to access the plane's control systems, according to the U.S. Federal Aviation Administration.

The computer network in the Dreamliner's passenger compartment, designed to give passengers in-flight internet access, is connected to the plane's control, navigation and communication systems, an FAA report reveals.