- Open Disk Management -> Win+R then 'diskmgmt.msc' and see the number of the disk you want.
- Open cmd as Administrator
- Type the command "C:\Program Files\Oracle\VirtualBox\VBoxManage.exe" internalcommands createrawvmdk -filename C:\Users\user\Desktop\raw-0.vmdk -rawdisk \\.\PHYSICALDRIVE0and replace the zero (0) from PHYSICALDRIVE0 with the number of the disk from Disk Management and the path to save the .vmdk file after -filename.
- Then you must start VirtualBox as Administrator and you can select the .vmdk file in your VM.
Note: If it's removable device eg. USB (Flash) Disk you may need to use LockDismount0300 to dismount the disk and stop windows from using it.