Partition a Hard Drive - Win7

For Windows 7:

1. Open Windows 7 Disk Management from the Computer Management utility.
2. As Disk Management opens, you should be prompted with an Initialize Disk window advising that "you must initialize a disk before Logical Disk Manager can access it."
   Choose MBR if your new hard drive is smaller than 2 terabytes or GPT if it's larger than 2 terabytes. Then click OK.
   Note: Don't worry just yet if you don't see this window. We'll know in the next step if something could be wrong with the physical hard drive installation.
3. With Disk Management open, locate the hard drive you want to partition from the graphical drive map on the bottom half of the screen.
   1. 1. 4. Shrink the current drive to leave space for the second drive. This leaves unallocated space on the disk. 
   
   
   5. Right click on unallocated and choose New Simple Volume, click Next. 
4. The next step, called Assign Drive Letter or Path, does just that, since your new partition will need a drive letter.
   Windows 7 automatically chooses the next available drive letter (skipping A and B) so if that drive letter is OK with you, just click Next >.
5. Click Finish to begin Windows 7's partition of the hard drive.
   Your cursor will turn busy for a few to several seconds. Once your new drive letter (E: in my example) appears in the drive listing at the top of the Disk Management screen, the partition of the hard drive is complete!
6. You may want to format the drive before using, but that's an option.