- `disk_size` (uint) - The size of the hard disk for the VM in megabytes. The builder uses expandable, not fixed-size virtual hard disks, so the actual file representing the disk will not use the full size unless it is full. By default this is set to 40000 (about 40 GB). - `cdrom_adapter_type` (string) - The adapter type (or bus) that will be used by the cdrom device. This is chosen by default based on the disk adapter type. VMware tends to lean towards ide for the cdrom device unless sata is chosen for the disk adapter and so Packer attempts to mirror this logic. This field can be specified as either ide, sata, or scsi. - `guest_os_type` (string) - The guest OS type being installed. This will be set in the VMware VMX. By default this is other. By specifying a more specific OS type, VMware may perform some optimizations or virtual hardware changes to better support the operating system running in the virtual machine. Valid values differ by platform and version numbers, and may not match other VMware API's representation of the guest OS names. Consult your platform for valid values. - `version` (string) - The [vmx hardware version](http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003746) for the new virtual machine. Only the default value has been tested, any other value is experimental. Default value is `9`. - `vm_name` (string) - This is the name of the VMX file for the new virtual machine, without the file extension. By default this is packer-BUILDNAME, where "BUILDNAME" is the name of the build. - `vmx_disk_template_path` (string) - VMX Disk Template Path - `vmx_template_path` (string) - Path to a [configuration template](/docs/templates/engine) that defines the contents of the virtual machine VMX file for VMware. The engine has access to the template variables `{{ .DiskNumber }}` and `{{ .DiskName }}`. This is for **advanced users only** as this can render the virtual machine non-functional. See below for more information. For basic VMX modifications, try `vmx_data` first.