Go to DOS command line (click on “Start Menu”, then type in “cmd” in search textbox, and hit “Enter”)
* Type in “DiskPart” in command line and hit enter.
* Type in “list disk” in command line and hit enter to show all disks in this machine.
* Type “select disk (the drive disk number in disk management)” and hit enter to set the focus to the specified drive, for example select disk 1 and hit enter. (1 represents the number of your disk in Disk management.)
* Type “clean” to zero sectors.
Go back to Disk Management, you can see the disk is “unallocated” now. Right click on "Not initialized", choose “Initialize Disk”. Then the drive should be ready to partition and format.
Now right click on the "Unallocated" area
Select "New Simple Volume or New Partition"
Agree with everything until you see this:
Default
NTFS
New Volume = ( name the drive whatever you would like )
Then put a checkmark in the box "Perform a quick format"
Select Apply or start
When the drive is ready for use it will say NTFS - Healthy
Here is a web link you can use from Microsoft that will guide you thru this process as well:
http://support.microsoft.com/kb/309000
pero vieja no es 
