How to Create a New Partition on a Windows 7

Step 1 : Open the Disk Management console by typing diskmgmt.msc at an elevated command prompt.

Step 2 : In Disk Management, right-click the volume that you want to shrink, and then click Shrink Volume.

Step 3 : In the field provided in the Shrink dialog box, enter the amount of space by which to shrink the disk. 

The Shrink dialog box provides the following information: 
Total Size Before Shrink In MB : Lists the total capacity of the volume in MB. This is the formatted size of the volume. 
Size Of Available Shrink Space In MB : Lists the maximum amount by which you can shrink the volume. This doesn’t represent the total amount of free space on the volume; rather, it represents the amount of space that can be removed, not including any data reserved for the master file table, volume snapshots, page files, and temporary files. 
Enter The Amount of Space To Shrink In MB : Lists the total amount of space that will be removed from the volume. The initial value defaults to the maximum amount of space that can be removed from the volume. For optimal drive performance, you should ensure that the volume has at least 10 percent of free space after the shrink operation. 
Total Size After Shrink In MB : Lists what the total capacity of the volume in MB will be after you shrink the volume. This is the new formatted size of the volume.

Step 4 : Click Shrink.

Step 5 : In Disk Management’s Graphical view, right-click an unallocated or free area, and then click New Simple Volume. This starts the New Simple Volume Wizard. 

Step 6 :Welcome page will show up, then click Next. 

Step 7 : The Specify Volume Size page specifies the minimum and maximum size for the volume in megabytes and lets you size the volume within these limits. Size the partition in megabytes using the Simple Volume Size field and then click Next.

Step 8 : On the Assign Drive Letter Or Path page, specify whether you want to assign a drive letter or path and then click Next.

Step 9 : Use the Format Partition page to determine whether and how the volume should be formatted.

Step 10 : Click Next, confirm your options, and then click Finish.