HP 8300 Small Form Factor, I5-3470, 8 Gbytes Ram with a SSD for the Operating systems.
There is an additional drive for the user data and a third for backups.
The first hard drive is divided into two partitions with Windows 7 X64 installed on the first primary partition which is of course NTFS. After the Windows 7 was fully installed updated, defragmented, consolidated and operating normally: I saved a copy of the Master Boot Record to a file: "Win7X64.mbr". Then I installed Linux Mint 19 on a second primary partition which is formatted as EXT4. Standard Grub boot with both "Linux Mint 19 Tara" and "Windows 7" as menu options for grub.
I chose to use VirtualBox because it can run the Windows guest OS in "seamless" mode so that the Windows applications appear to be running on the Mate Desktop. Oral VirtualBox 5.2.20 was installed on Linux Mint along with the Oracle VirtualBox extension pack. Then I made a vdmk file to point to the first partition of the disk drive:
sudo VBoxManage internalcommands createrawvmdk -filename "win7x64.vmdk" -rawdisk /dev/sda -partitions 1 -mbr "win7x64.mbr" -relative
I can now run the Windows 7 OS inside VirtualBox or Boot that same Windows 7 OS from the grub menu (I had read that this could not be done --- it can). There is a bit of a performance hit for the VM mode: So here is the RUB:
In order for VirtualBox to access the raw disk it has to be run as root. With the loss of gksudo that means opening up a terminal window and running the command:
sudo virualbox --startvm Win7Test
That leaves two extra windows/tabs on the desktop/menu bar: One for the terminal window and the other for the virtualbox gui. I am tring to figure out how to launch the virtualbox gui without resorting to using a terminal window.