Read: How to create New, Resize, Extend Partition using Disk Management Tool. If you want more than 4 partitions then you must use the DISKPART utility to create an extended volume that can hold ...
The Windows tool Diskpart overwrites all data on the hard drive with a zero, which is considered a secure deletion method.
Diskpart utility has a list of commands ... leaving existing files and directories intact. create Creates a partition on a disk, a volume on one or more disks, or a virtual hard disk (VHD).