Initialize new disk partition on Hyper-V Core

• On the HyperV go to the command prompt
• Type diskpart, enter
• To view current disks, type list disk, enter
• To select the disk you wish to initialize, type select disk=1, enter
• Create the partition, type create partition primary, enter
• Assign letter, type assign letter=E, enter
• Format the partition
  • Select the partition, type select partition=1, enter
  • Format, type format fs=NTFS label="Storage" quick

Sources

• http://community.spiceworks.com/topic/210166-how-to-make-raid-active-or-assign-drive-letter
• http://technet.microsoft.com/en-us/library/cc766465(v=ws.10).aspx