How to Format Unallocated Space
Unallocated space is unused and unformatted space on a disk drive. Unallocated space is typically the result of deleting a partition and is unusable until formatted with a file system your operating system can understand. Formatting the free space is fairly simple using the Windows Disk Management utility.
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Instructions
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Open the "Start" menu and select "Control Panel." Select "System and Maintenance," then "Administrative Tools."
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Double-click "Computer Management." Select "Storage," then "Disk Management."
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Right-click the unallocated space and select "New Simple Volume."
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Enter a name for the new partition, then enter the desired size. The size must be entered in megabytes. Select the desired file system format.
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Click "Next," then "Finish" to format the unallocated space to create the new partition.
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