Dividing your hard disk into two or more logical storage units is called disk partitioning. On a partitioned hard drive, the drive letters (most often C, D, E and F) represent the different local disk partitions. Disk partitioning facilitates data storage and frees up system resources. Windows provides disk-partitioning capability through its disk management utility. You can both add and remove local disk partitions through this utility, but back up your important files before doing so.
Step 1
Click "Start" (the Windows-logo button on the lower-left-hand corner of the screen)-->"Control Panel"-->"System and Security"-->"Administrative Tools." Double-click "Computer Management."
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Step 2
Click "Disk Management" on the left pane under "Storage."
Step 3
Look at the different disk partitions in the middle of the screen.
Step 4
Right-click on the disk partition you want to delete and select "Delete Volume."
Step 5
Click "Yes" in the confirmation box to delete the disk partition.
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