Once you click Start the virtual machine will boot using the VMDK file you selected as the virtual hard disk file. Click “Start” at the VirtualBox Manager screen to boot the VMDK virtual machine.Now choose “Create” to create the new virtual machine using the VMDK file.Confirm the VMDK drive is selected then select “Choose”.Navigate to and select the VMDK file and choose “Open”.Click “Add” to add a virtual hard disk file.Give the new virtual machine a name and set the type, OS version, RAM, and then click to choose “Use an existing virtual hard disk file” and click the folder icon to navigate the file system.Open the VirtualBox application, then choose “New” to create a new virtual machine.How to Open a VMDK File with VirtualBox on Mac, Windows, Linux

Instead you’ll create a new virtual machine and use that as the disk, using the steps outlined below. You may have noticed that you can’t simply open a VMDK virtual machine file directly with VirtualBox, nor can you drag and drop it to launch. VMDK is short for Virtual Machine Disk, and VMDK files can be created by VMWare, VirtualBox, Parallels, and other virtualization software.

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