If you have guest operation systems already created for your VMware Workstation, there is no need to create a new one for VirtualBox. All you have to do is import the existing VMware format to VirtualBox. It’s easy. In the past, the only way one could use VMware guest machines was to convert the .vmdk disk into .vdi, .ova of .ovf file format. You don’t need to do that anymore. VirtualBox does this automatically now. It’s so simple. To use an existing VMware Workstation disk (.vmdk), all you have to do is follow the guide below: Before attempting to import the .vmdk image into VirtualBox, you must first install the extension pack. When the extension pack is installed, you can then continue below. First, open Oracle VirtualBox host software. Click New –> Create Virtual Machine. Then create a new virtual machine, select the type of machine and version and click Next. Then select the option to use an existing virtual hard disk file. Next, use the browse folder to browse to where the current VMware disk (.vmdk) disk file is located and select it. VirtualBox should automatically convert the existing .vmdk disk to a compatible format for VirtualBox. Remember the virtual disk will be shared by both the VMware Workstation and VirtualBox host software. You can only run one virtualization software using the same guest machine at a time. If you delete the virtual machine from either host software, the file will be deleted for both machines. To smoothly run the guest machine under both VMware Workstation and VirtualBox, install the open-source guest tool below on a Linux guest machine. This should get you working easily. Summary: This post shows students and new users an easy way to use existing VMware Workstation disks on VirtualBox. VirtualBox extension pack must first be installed before importing the .vmdk disk file. When you import the .vmdk file, both host software will share the same file. deleting it from either software including the disk file will delete it everywhere. Enjoy! You may also like the post below: