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[#]: collector: (lujun9972)
[#]: translator: (robsean)
[#]: reviewer: ( )
[#]: publisher: ( )
[#]: url: ( )
[#]: subject: (Dual booting Windows and Linux using UEFI)
[#]: via: (https://opensource.com/article/19/5/dual-booting-windows-linux-uefi)
[#]: author: (Alan Formy-Duval https://opensource.com/users/alanfdoss/users/ckrzen)
Dual booting Windows and Linux using UEFI
======
A quick rundown of setting up Linux and Windows to dual boot on the same
machine, using the Unified Extensible Firmware Interface (UEFI).
![Linux keys on the keyboard for a desktop computer][1]
Rather than doing a step-by-step how-to guide to configuring your system to dual boot, I’ll highlight the important points. As an example, I will refer to my new laptop that I purchased a few months ago. I first installed [Ubuntu Linux][2] onto the entire hard drive, which destroyed the pre-installed [Windows 10][3] installation. After a few months, I decided to install a different Linux distribution, and so also decided to re-install Windows 10 alongside [Fedora Linux][4] in a dual boot configuration. I’ll highlight some essential facts to get started.
### Firmware
Dual booting is not just a matter of software. Or, it is, but it involves changing your firmware, which among other things tells your machine how to begin the boot process. Here are some firmware-related issues to keep in mind.
#### UEFI vs. BIOS
Before attempting to install, make sure your firmware configuration is optimal. Most computers sold today have a new type of firmware known as [Unified Extensible Firmware Interface (UEFI)][5], which has pretty much replaced the other firmware known as [Basic Input Output System (BIOS)][6], which is often included through the mode many providers call Legacy Boot.
I had no need for BIOS, so I chose UEFI mode.
#### Secure Boot
One other important setting is Secure Boot. This feature detects whether the boot path has been tampered with, and stops unapproved operating systems from booting. For now, I disabled this option to ensure that I could install Fedora Linux. According to the Fedora Project Wiki [Features/Secure Boot ][7] Fedora Linux will work with it enabled. This may be different for other Linux distributions —I plan to revisit this setting in the future.
In short, if you find that you cannot install your Linux OS with this setting active, disable Secure Boot and try again.
### Partitioning the boot drive
If you choose to dual boot and have both operating systems on the same drive, you have to break it into partitions. Even if you dual boot using two different drives, most Linux installations are best broken into a few basic partitions for a variety of reasons. Here are some options to consider.
#### GPT vs MBR
If you decide to manually partition your boot drive in advance, I recommend using the [GUID Partition Table (GPT)][8] rather than the older [Master Boot Record (MBR)][9]. Among the reasons for this change, there are two specific limitations of MBR that GPT doesn’t have:
* MBR can hold up to 15 partitions, while GPT can hold up to 128.
* MBR only supports up to 2 terabytes, while GPT uses 64-bit addresses which allows it to support disks up to 8 million terabytes.
If you have shopped for hard drives recently, then you know that many of today’s drives exceed the 2 terabyte limit.
#### The EFI system partition
If you are doing a fresh installation or using a new drive, there are probably no partitions to begin with. In this case, the OS installer will create the first one, which is the [EFI System Partition (ESP)][10]. If you choose to manually partition your drive using a tool such as [gdisk][11], you will need to create this partition with several parameters. Based on the existing ESP, I set the size to around 500MB and assigned it the ef00 (EFI System) partition type. The UEFI specification requires the format to be FAT32/msdos, most likely because it is supportable by a wide range of operating systems.
![Partitions][12]
### Operating System Installation
Once you accomplish the first two tasks, you can install your operating systems. While I focus on Windows 10 and Fedora Linux here, the process is fairly similar when installing other combinations as well.
#### Windows 10
I started the Windows 10 installation and created a 20 Gigabyte Windows partition. Since I had previously installed Linux on my laptop, the drive had an ESP, which I chose to keep. I deleted all existing Linux and swap partitions to start fresh, and then started my Windows installation. The Windows installer automatically created another small partition—16 Megabytes—called the [Microsoft Reserved Partition (MSR)][13]. Roughly 400 Gigabytes of unallocated space remained on the 512GB boot drive once this was finished.
I then proceeded with and completed the Windows 10 installation process. I then rebooted into Windows to make sure it was working, created my user account, set up wi-fi, and completed other tasks that need to be done on a first-time OS installation.
#### Fedora Linux
I next moved to install Linux. I started the process, and when it reached the disk configuration steps, I made sure not to change the Windows NTFS and MSR partitions. I also did not change the EPS, but I did set its mount point to **/boot/efi**. I then created the usual ext4 formatted partitions, **/** (root), **/boot** , and **/home**. The last partition I created was Linux **swap**.
As with Windows, I continued and completed the Linux installation, and then rebooted. To my delight, at boot time the [GRand][14] [Unified Boot Loader (GRUB)][14] menu provided the choice to select either Windows or Linux, which meant I did not have to do any additional configuration. I selected Linux and completed the usual steps such as creating my user account.
### Conclusion
Overall, the process was painless. In past years, there has been some difficulty navigating the changes from UEFI to BIOS, plus the introduction of features such as Secure Boot. I believe that we have now made it past these hurdles and can reliably set up multi-boot systems.
I don’t miss the [Linux LOader (LILO)][15] anymore!
--------------------------------------------------------------------------------
via: https://opensource.com/article/19/5/dual-booting-windows-linux-uefi
作者：[Alan Formy-Duval][a]
选题：[lujun9972][b]
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://opensource.com/users/alanfdoss/users/ckrzen
[b]: https://github.com/lujun9972
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/linux_keyboard_desktop.png?itok=I2nGw78_ (Linux keys on the keyboard for a desktop computer)
[2]: https://www.ubuntu.com
[3]: https://www.microsoft.com/en-us/windows
[4]: https://getfedora.org
[5]: https://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface
[6]: https://en.wikipedia.org/wiki/BIOS
[7]: https://fedoraproject.org/wiki/Features/SecureBoot
[8]: https://en.wikipedia.org/wiki/GUID_Partition_Table
[9]: https://en.wikipedia.org/wiki/Master_boot_record
[10]: https://en.wikipedia.org/wiki/EFI_system_partition
[11]: https://sourceforge.net/projects/gptfdisk/
[12]: /sites/default/files/u216961/gdisk_screenshot_s.png
[13]: https://en.wikipedia.org/wiki/Microsoft_Reserved_Partition
[14]: https://en.wikipedia.org/wiki/GNU_GRUB
[15]: https://en.wikipedia.org/wiki/LILO_(boot_loader)

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[#]: collector: (lujun9972)
[#]: translator: (robsean)
[#]: reviewer: ( )
[#]: publisher: ( )
[#]: url: ( )
[#]: subject: (Dual booting Windows and Linux using UEFI)
[#]: via: (https://opensource.com/article/19/5/dual-booting-windows-linux-uefi)
[#]: author: (Alan Formy-Duval https://opensource.com/users/alanfdoss/users/ckrzen)
使用 UEFI 双启动 Windows 和 Linux
======
在同一台机器上设置 Linux 和 Windows 双重启动的一份速成解释，使用统一可扩展固件接口（UEFI）。
![键盘上的 Linux 的按键字母][1]
我将强调一些重要点，而不是一步一步地指导你来如何配置你的系统以实现双重启动。作为一个示例，我将提到我在几个月之前新买的笔记本计算机。我首先安装 [Ubuntu Linux][2] 到整个硬盘中，这就摧毁了预装的 [Windows 10][3] 安装。几个月后，我决定安装一个不同的 Linux 发行版，也决定在双重启动配置中与 [Fedora Linux][4] 一起重新安装 Windows 10 。我将强调一些极其重要的实际情况。让我们开始吧！
### 固件
双重启动不仅仅是软件问题。或者说它算是软件的问题, 因为它需要更改你的固件，以告诉你的机器如何开始启动程序。这里有一些和固件相关的重要议题要铭记于心。
#### UEFI vs BIOS
在尝试安装前，确保你的固件配置是最佳的。现在出售的大多数计算机有一个名为 [统一可扩展固件接口 （UEFI）][5] 的新固件类型，UEFI 差不多取代了另一个名为 [基本输入输出系统 (BIOS)][6] 的固件类型，（包括很多固件供应商在内的很多人）通常称 BIOS 为传统启动模式。
我不需要 BIOS ，使用我选择了 UEFI 模式。
#### 安全启动
另一个重要的设置是安全启动。这个功能将检测启动路径是否被篡改，并阻止未经批准的操作系统的启动。现在，我禁用这个选项来确保我能够安装 Fedora Linux 。依据 Fedora 项目维基 [功能/安全启动][7] 的介绍可知：Fedora Linux 在安全启动选项启用的时候也可以工作。这对其它的 Linux 发行版来说可能有所不同 — 我打算今后重新研究这项设置。
简而言之，如果你发现在这项设置启用时你不能安装你的 Linux 操作系统，那么禁用安全启动并再次重新尝试安装。
### 分区启动驱动器
如果你选择双重启动并且两个操作相同都在同一个驱动器上，那么你必须将你分成多个分区。即使你使用两个不同的驱动器进行双重启动，出于各种各样的原因，大多数 Linux 安装也最好分成几个基本的分区。这里有一些选项值得考虑。
#### GPT vs MBR
如果你决定手动分区你的启动驱动器，在动手前，我建议使用 [GUID 分区表 (GPT)][8] ，而不是使用旧的 [主启动记录 (MBR)][9] 。这种更改的原因之一是：MBR 有两个特定的限制，而 GPT 却没有：
* MBR 可以最多拥有 15 个分区，而 GPT 可以最多拥有 128 个分区。
* MBR 最多仅支持 2 TB ，而 GPT 使用 64 位地址，这使得它最多支持 800 万 TB 的磁盘。
如果你最近购买过硬盘，那么你可能会知道现代的很多硬盘都超过了 2 TB 的限制。
#### EFI 系统分区
I如果你正在进行一次全新的安装或使用一块新的驱动器，那么这里可能没有可以开始的分区。在这种情况下，操作系统安装程序将先创建一个分区，即 [EFI 系统分区 (ESP)][10] 。如果你选择使用一个诸如 [gdisk][11] 之类的工具来手动分区你的驱动器，你将需要使用一些参数来创建这个分区。基于现有的 ESP ，我设置它为约 500 MB 的大小，并分配它为 ef00（ EFI 系统 ）分区类型。UEFI 规范要求格式为 FAT32/msdos ，很可能是因为这种格式被大量的操作系统所支持。
![分区][12]
### 操作系统安装
在你完成先前的两个任务后，你就可以安装你的操作系统了。虽然我在这里关注的是 Windows 10 和 Fedora Linux ，当安装其它组合时的过程也是非常相似。
#### Windows 10
我开始 Windows 10 的安装，并创建了一个 20 GB的 Windows 分区。因为我先前在我的笔记本计算机上安装了 Linux ，所以驱动器已经有了一个 ESP ，我选择保留它。我删除所有的现有 Linux 和 swap 分区来开始 fresh ，然后开始我的 Windows 安装。Windows 安装程序自动创建另一个小分区—16 MB—称为 [Microsoft 保留分区 (MSR)][13] 。在这完成后，在 512 GB 启动分区上仍然有大约 400 GB 的b未分配空间。
接下来，我继续完成了 Windows 10 安装过程。随后我重新启动到 Windows 来确保它是工作的，在操作系统第一次启动时，创建我的用户账号，设置 wi-fi ，并完成其它必须的任务。
#### Fedora Linux
接下来，我将心思转移到安装 Linux 。当安装重新到到磁盘配置的步骤时，我开始了这个过程，我确保不更改 Windows 的 NTFS 和 MSR 分区。我也不更改 EPS ，但是我设置它的挂载点位 **/boot/efi** 。然后我创建常用的 ext4 格式分区， **/** (root) ， **/boot** ，和 **/home** 。我创建的最后一个分区是 Linux 的 **swap** 。
像安装 Windows 一样，我继续完成了 Linux 安装，随后重新启动。令我高兴的是，在启动时 [GRand][14] [统一启动加载程序 (GRUB)][14] 菜单提供选择 Windows 或 Linux 的选项，这意味着我不需要再做任何额外的配置。我选择 Linux 并完成了诸如创建我的用户账号等常规步骤。
### 总结
总体而言，这个过程是不难的，在过去的几年里，从 UEFI 到 BIOS 有一些不同的成功克服困难的更改，加上诸如安全启动等功能的引入。我相信我们现在已经克服了这些障碍，可以可靠地设置多重启动系统。
我不再怀念 [Linux LOader (LILO)][15] ！
--------------------------------------------------------------------------------
via: https://opensource.com/article/19/5/dual-booting-windows-linux-uefi
作者：[Alan Formy-Duval][a]
选题：[lujun9972][b]
译者：[robsean](https://github.com/robsean)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://opensource.com/users/alanfdoss/users/ckrzen
[b]: https://github.com/lujun9972
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/linux_keyboard_desktop.png?itok=I2nGw78_ (Linux keys on the keyboard for a desktop computer)
[2]: https://www.ubuntu.com
[3]: https://www.microsoft.com/en-us/windows
[4]: https://getfedora.org
[5]: https://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface
[6]: https://en.wikipedia.org/wiki/BIOS
[7]: https://fedoraproject.org/wiki/Features/SecureBoot
[8]: https://en.wikipedia.org/wiki/GUID_Partition_Table
[9]: https://en.wikipedia.org/wiki/Master_boot_record
[10]: https://en.wikipedia.org/wiki/EFI_system_partition
[11]: https://sourceforge.net/projects/gptfdisk/
[12]: /sites/default/files/u216961/gdisk_screenshot_s.png
[13]: https://en.wikipedia.org/wiki/Microsoft_Reserved_Partition
[14]: https://en.wikipedia.org/wiki/GNU_GRUB
[15]: https://en.wikipedia.org/wiki/LILO_(boot_loader)