When you create a Hyper-V virtual machine, the first and permanent choice is its generation. Generation 1 VMs emulate a traditional BIOS PC: they boot from an IDE controller, can use legacy network adapters for PXE, and support 32-bit guest operating systems. Generation 2 VMs use UEFI firmware, boot from SCSI disks, PXE boot with the standard synthetic network adapter, and support Secure Boot and a virtual TPM. Generation 2 has no IDE or legacy devices at all. You cannot change a VM's generation after creation, so choose generation 2 for any modern 64-bit Windows or Linux guest, and generation 1 only for old or 32-bit guests or if you must reuse an old VHD boot disk.
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