Windows 10 is familiar and easy to use, with lots of similarities to Windows 7 including the Start menu. It starts up and resumes fast, has more built-in security to help keep you safe, and is designed to work with software and hardware you already have. To Create new partition with unallocated partition in windows OS follow with steps this is for Windows 8 and Windows 10
To create a partition or volume (the two terms are often used interchangeably) on a hard disk, you must be logged in as an administrator, and there must be either unallocated disk space or free space within an extended partition on the hard disk.
How to Create new partition with unallocated partition in windows OS
Steps 1. In the Metro Start Menu, click on the lower left corner. The Start menu pops up. Click on Search.
Steps 2. Step Type compmgmt.msc in the App list Search box. Click on compmgmt under the Apps Result.
Steps 3. In the left pane, click Disk Management.
Steps 4. Right click the Unallocated space and select New Simple Volume.
Steps 5. The New Simple Volume Wizard will launch. Click Next to continue.
Steps 6. Adjust the new volume size and click Next.
Steps 7. Now select the drive letter and click Next.
Steps 8. Select Format this volume with the following settings. Enter the Volume Label and check Perform a quick format. Click Next when done.
Steps 9. The wizard will now display a summary on the successful creation of a new partition. Click Finish.