You can configure most virtual machine hardware settings when you create a virtual machine or after you create the virtual machine and install the guest operating system. What to read next Virtual CPU Configuration and LimitationsYou can set most of the CPU parameters when you create virtual machines or after you install the guest operating system. Some actions require that you power off the virtual machine before you change the settings. Virtual Memory ConfigurationYou can add, change, or configure virtual machine memory resources or options to improve virtual machine performance. You can set most of the memory parameters during virtual machine creation or after the guest operating system is installed. Network Virtual Machine ConfigurationESXi networking features enable communication between virtual machines on the same host, between virtual machines on different hosts, and between other virtual and physical machines. Virtual Disk ConfigurationYou can add large-capacity virtual disks to virtual machines and add more space to existing disks, even when the virtual machine is running. Virtual Machine Controller Configuration in the VMware Host ClientIn the VMware Host Client, you can add various controllers to virtual machines, such as USB controllers, SCSI controllers, Paravirtual SCSI controllers, and SATA controllers. You can also change the SCSI Bus sharing configuration and the SCSI controller type. Other Virtual Machine Device Configuration in the VMware Host ClientIn addition to configuring virtual machine CPU and Memory, and adding hard disks and virtual network adapters, you can also add and configure virtual hardware, such as DVD/CD-ROM drives, floppy drives, and SCSI devices. You can also add a virtual Watchdog Timer (VWDT) device, Precision Clock device, and PCI devices. Securing Virtual Machines in the VMware Host Client The guest operating system that runs in the virtual machine is vulnerable to the same security risks as any physical system.