Since this will most likely be a temporary test system, the 50 GB dynamically allocated hard drive should work just fine. When you get to that point, name the virtual hard drive with the same name that you assigned to the virtual machine, and click the Create button.
When you complete Create Virtual Machine wizard, you are ready to install the Windows 10 technical preview.
How to install Windows 10 technical preview on VirtualBox
Follow these steps to install Windows 10 on VirtualBox:
Step 1: After you create the virtual hard drive, you will be sent back to the VirtualBox main screen. Now, go into the settings for this virtual machine, and navigate to the Storage tab. Under Controller: SATA, Select the disk icon, which should probably read Empty.
On the right side, under Attributes, click the disk icon, select choose Virtual Optical Disk File, and then locate the Windows 10 ISO you downloaded earlier. Now click on OK button.
Step 2: With all of that setup finished, double click to power on the virtual machine and begin the Windows 10 installation process. From here on in, it’s just like any normal Windows installation, with the usual occasional reboots.
The reboots happen inside VirtualBox, not on your machine itself. There is only one important choice you need to make – select Custom: Install Windows only (advanced) when you are given a choice between that and a standard installation.
After the installation completes, you will need to go through the out-of-box experience guided by Cortana to finish personalizing your installation.
How to install VirtualBox guest additions
Once you are at the Windows 10 desktop, you will need to install all of the proper drivers for VirtualBox. In the VirtualBox UI, go to Devices, and then select Insert Guest Additions CD image.
Navigate to that disc image in Windows Explorer, and run the installer. Once you have gone through the entire process, you will need to reboot the virtual machine.
Your Windows 10 is ready
Back at the desktop, you can finally use full-screen mode at the proper resolution. In the VirtualBox menu, go to View, and select Switch to Fullscreen. For the most part, this is now the same experience you would have running it natively.
Enjoy yourself, and feel free to poke around all the new features.
