What are the differences between Generation 1 and Generation 2 virtual machines?
What will be an ideal response?
The first big difference between Generation 1 and Generation 2 virtual machines is the firmware emulation. Generation 1 virtual machines use BIOS-based firmware, which supports a wider range of operating systems. Generation 2 virtual machines use UEFI-based firmware, which is supported only by 64-bit editions of Windows Server 2012 or newer, Windows 8 or newer, and some Linux distributions.
Generation 1 virtual machines can only boot from virtual hard disks attached to a virtual IDE controller. The paging file for Windows must also be on a virtual hard disk attached to an IDE controller. IDE is limiting because you can have a maximum of two controllers and only two devices on each controller. However, you can add a SCSI controller for additional virtual hard drives. Generation 2 virtual machines have only SCSI disk controllers.
Legacy network adapters are available only in Generation 1 virtual machines. A legacy
network adapter is required to support Preboot Execution Environment (PXE) in Generation 1 VMs. In Generation 2 virtual machines, the synthetic network adapter has been improved to support PXE. Therefore, legacy network adapters are not available in Generation 2 virtual machines.
Floppy disk controllers are not present in modern computers and they are not included in Generation 2 virtual machines.
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