1. Vbox Raw Disk

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This is strange there is no way to add a physical disk to your virtual machine under virtualbox! Still it is possible and it is simple, but you need to execute few commands under console so you need to open a terminal and to have a root privileges!
To use a raw disk in our virtual machine we must create a special VMDK file and then to use it when adding a hard drive to our virtualbox virtual machine with “Use an existing virtual hard disk dile”.

Here are the right steps to add a raw disk:

STEP 1) Permissions – your user must have (write) permissions to access raw disks

In most cases your user do not have write permission to the disk – it is the same under MS Windows and any Linux distribution (and probably MAC)! So here is the right way how to give permissions under Linux and Windows:

• Under Linux (Ubuntu, Centos, Fedora, Gentoo and probably all other). There are at least two ways to give WRITE permission to the raw disk (use one of them, the first one is preferred). We want to add our third disk the “/dev/sdc” so the examples are with this device:
  1. add your user to “disk” group and log out. After you log in you’ll have WRITE permissions to the disks. Probably you must log off your GUI (Gnome, KDE and so on), too!

     “myuser” is the username of the user I am logged in. The log out and log in (if you are using a GUI – gnome, kde or something else, you must log out from the GUI, too and then log in again).

  2. execute virtualbox with root user
  3. change the permission of the physical device you want to use (this is temporary, because next time you reboot you must change it again)
• Under Windows 10 (or 7) – you must start the command prompt and Virtualbox with “run as Administrator” – look at the next step (STEP 2).

STEP 2) Add the raw disk

• Under Linux (use one of these solutions)
  • With ordinary user and WRITE permission is set:

    As you can see no root is required and now you can start VirtualBox without root permissions as always you have done it.

  • With root user

    “/home/myuser” is my home user directory. Yours could be with different name so change the name accordingly.

  • Under Windows (7 and 10)
    1. First you must start the command line tool under linux also with administrative privileges!
       Search for command prompt and with right click you hit “Run as administrator”. Change the directory to the VirtualBox executables and then execute the command. Use your path for “filename” (c:Usershomer.VirtualBoxphysical-sdc.vmdk – change to your path), your home user directory or nay other directory you use for storing the VirtualBox files.
       
    2. Accept the privileges escalation:
       
    3. Execute the following line:
    4. As you can see now we have a generated file, which can use when creating a virtual machine (look at STEP3))
       

  * Create virtual machine under Linux and Windows using raw disk

  1. Under Windows 10 (and 7) we must run VirtualBox as administrator. Skip this if you are using linux.
     
  2. Confirm administrator privileges escalation under Windows 10 (and 7). Skip this if you are using linux.
     
  3. Create Virtual Machine with name “test”
     
  4. Set the memory to the virtual machine – for example 1024Mbytes.
     
  5. Set the hard disk – our VMDK file to use our raw disk. Check “Use an existing virtual hard disk file” and click on “Choose a virtual hard disk file…” – a dialog will open.
     
  6. Navigate to where is your freshly created VMDK file from the STEP 2) and select it to open.
     
  7. Click “Create” to create the virtual machine.
     

  * Here is how it looks like our VMDK file in VirtualBox “Virtual Media Manager”

  • Under Windows 10
    
  • Under Linux
    

  * Troubleshooting under Linux

  The permission problem accessing the disk under linux – NO WRITE permissions here:

  * Troubleshooting under Windows (10)

  The permission problem accessing the disk under linux – NO WRITE permissions here:

  You did not execute Command Prompt “Run as administrator”

  And if you get the following error:

  1. Create a virtual machine with our VMDK file
     
  2. Use our VMDK file
     
  3. VirtualBox – Error
     

  What is in the VMDK file generated for a raw disk

  • Linux
  • Windows

I have written VBoxRawdisk, a utility for macOS to help use a raw disk with VirtualBox.
This is the first release and should be considered alpha level software.
The software does nothing that you can't do manually with VBoxManage, diskutil and the command line. However - I frequently use raw disks and doing it manually got to be a pain in the butt.
I am very open to suggestions for improvements to how it is operating and welcome any feedback.
Be warned - if you don't know what you are doing it is very easy to destroy data by overwriting the wrong files or selecting the wrong drives.
VBoxRawdisk will only work with whole disks - i.e. it has no provision for using raw partitions.
Usage and limitations are described at https://www.whatroute.net/vboxrawdisk.html#usage
The link to download the utility is also on this page.
Regards
Bryan

Vbox Raw Disk

[Mod edit: e-mail address removed]