Win8 system has a considerable improvement in boot speed compared to the Win7 system. This is because Win8 system has added technologies such as boot boot and application pre-caching in order to improve system performance and hardware optimization. The UEFI BIOS booting makes the platform boot smarter and the boot speed is faster. Compared with the traditional BIOS boot startup mode, UEFI BIOS reduces the steps of BIOS self-test, saving a lot of time and speeding up the startup of the platform. Steps: But not all WIN8 can be installed in UEFI mode. Even if your BIOS is UEFI BIOS, sometimes it will not be installed. This is because it is related to the partition structure of the hard disk, whether WIN 8 is 32-bit or 64-bit. In the UEFI BIOS, in order to be compatible with the previous operating system, the Legacy BIOS mode is also provided. Let's talk about the relationship between the two BIOS modes and the hard disk partition form: Legacy BIOS mode: support all 32-bit WINDOWS 8 system installation, support in The 64-bit WINDOWS 8 installation under the MBR hard disk partition structure does not support the GPT partition structure of the hard disk. At this time, the BIOS should be the following settings (the following are all examples of G480 BIOS): At this time, if WINDOWS 8 is installed and the partition structure of the hard disk is GPT, the following prompts will be displayed during the installation process: UEFI BIOS mode: Support GPT The installation of the 64-bit WINDOWS 8 system under the partition structure, the BIOS settings are as follows: At the same time, you need to change the default system optimization options (some models do not have this option): After the above options are complete, you can install WIN8, but Sometimes we will have no CD-ROM boot (or U disk) option during installation (some BIOS shows options but can't boot): At this point, we need to adjust the SECURE BOOT option again, this option DISABLE can successfully boot : If you install 64-bit WINDOWS 8 in UEFI mode and the hard disk partition mode is MBR, the following prompt will appear: At this point we need to press SHIFT+F10 to enter CMD mode, use DISKPART disk tool to convert MBR sub-table area to GPT mode, the specific command is: convert gpt (note, change the data in the partition mode hard disk will be lost, please backup the data in advance and then do this operation): Remarks: The following describes a Knowledge related to this article: 1. MBR partition table: Master Boot Record, which is the hard disk master boot record partition table, only supports hard disks with a capacity of less than 2.1TB. More than 2.1TB hard disks can only manage 2.1TB, and only support up to 4 hard disks. A primary partition or three primary partitions and one extended partition, and there can be multiple logical partitions under an extended partition. 2. GPT partition table: GPT, globally unique partition table (GUID Partition Table), compared with the limit of MBR maximum 4 partition table items, GPT has no limit on the number of partitions, but Windows only supports 128 GPT partitions, GPT The manageable hard drive size is up to 18EB. Only the UEFI platform-based motherboard supports GPT partition boot startup. 3. ESP partition: EFI system partition, which is used for the computer system that uses EFI BIOS to boot the operating system. The boot management program, driver, system maintenance tools, etc. are stored in the sub-area. If the computer uses an EFI system, or if the current disk is used to boot the operating system on the EFI platform, an ESP partition should be recommended. 4. MSR partition: Microsoft reserved partition, which is reserved for reserved space on GPT disk, such as when converting disk to dynamic disk. 5. SECURE BOOT function: Windows 8 has added a new security function. Secure Boot is built into UEFI BIOS to protect against malware infected with MBR and BIOS. Windows 8 will use Secure Boot by default. Any module to be loaded must be signed (mandatory), and the UEFI firmware will verify that it will not be loaded if it is not signed or cannot be verified.