如果您在启动 Windows 10 设备时，但您的计算机无法启动，并且您只看到黑屏消息BOOTMGR is compressed, Press Ctrl+Alt+Del to restart，那么这篇文章可能会对您有所帮助。

文件压缩是一项允许 PC 用户减小文件、文件夹和程序的大小并减少磁盘空间使用的功能。但是，由于系统引导扇区代码本身缺乏解压文件的能力，因此作为引导过程的关键部分的 BOOTMGR 文件不应该被压缩，否则在Windows 10启动时会遇到此错误。

启动管理已被压缩

如果您遇到此问题，您可以尝试以下我们推荐的解决方案（不分先后顺序），看看是否有助于解决问题。

1. 运行启动修复
2. 重建引导配置数据^{(Rebuild Boot Configuration Data)}( BCD ) 文件
3. 手动更新 BOOTMGR 文件
4. 解压驱动器。

让我们看一下关于列出的每个解决方案所涉及的过程的描述。

1]运行启动修复

由于此BOOTMGR已压缩错误会阻止您的 Windows 10 系统启动并完全启动到桌面，因此要采取的第一个合乎逻辑的步骤是执行 Windows 10 启动修复^{(perform Windows 10 Startup Repair)}。运行启动修复 3^{(Startup Repair three)}次不同的时间，因为有时需要运行 3 次才能修复它。如果这不能解决您的问题，请转到下一个选项。

2]重建引导配置数据^{(Rebuild Boot Configuration Data)}（BCD）文件

此解决方案要求您重建引导配置数据 (BCD)^{(rebuild the Boot Configuration Data (BCD))}。

3]手动更新BOOTMGR文件

由于引导错误通常是由压缩的BOOTMGR文件引起的，因此更换文件通常是一个很好且有效的解决方案。

要手动更新BOOTMGR文件，请执行以下操作：

^(Boot)通过启动您的 PC 并在您看到Windows徽标时启动中断Windows 10 ；按住电源按钮强制关机。重复此操作 2-4 次，Windows将为您打开“高级启动选项^{(Advanced Startup Options)}”菜单。

或者，如果可用，您可以使用 Windows 10 安装媒体将您的 PC 引导至“高级启动选项”^{(use the Windows 10 installation media to boot your PC into the Advanced Startup Options)}菜单。

• 在“高级启动^{(Advanced Startup)} 选项^(Options)”屏幕上，选择“ 高级选项”。^{( Advanced Options.)}
• 选择 疑难解答。^{( Troubleshoot.)}
• 在高级^(Advanced)选项屏幕下，选择命令提示符。^{( Command Prompt.)}
• 接下来，键入cd并按 Enter。
• 现在，键入  C:并按 Enter。
• 接下来，输入以下命令并按Enter：

bcdboot C:\Windows /s D:\

命令执行后，重新启动计算机并查看它是否成功启动而没有出现问题。否则^(Otherwise)，请尝试下一个解决方案。

4]解压缩/解压缩驱动器

由于此错误通常是由压缩的硬盘驱动器引起的，因此可以通过解压缩或解压缩系统驱动器来修复它。

要解压缩/解压缩驱动器，请执行以下操作：

• ^(Boot)使用上述解决方案 3^{(Solution 3)}中的任何方法启动到高级启动^{(Advanced Startup)} 选项^(Options) 。
• 访问命令提示符^{(Access Command Prompt)}并切换到 C 目录，如上所示。
• 在CMD提示符下，键入以下命令并按Enter：

compact /u /s /i *.*

命令执行后，重新启动计算机。现在应该解决这个问题。

希望这可以帮助！

相关帖子^{(Related post)}：修复 Bootmgr 在 Windows 10 中缺少错误。

Fix BOOTMGR is compressed - Windows 10 startup error

If when you boot your Windows 10 device, but your computer fаils to boot and you only see a black screen with the message BOOTMGR is compressed, Press Ctrl+Alt+Del to restart, then this post is likely to help you.

File compression is a feature that allows PC users to decrease the size of files, folders, and programs, and reduce disk space usage. However, since the system boot sector code lacks the ability to decompress files by itself, the BOOTMGR file, which is a key part of the booting process, should not be compressed, otherwise, you’ll encounter this error on Windows 10 startup.

BOOTMGR is compressed

If you’re faced with this issue, you can try our recommended solutions below in no particular order and see if that helps to resolve the issue.

1. Run Startup Repair
2. Rebuild Boot Configuration Data (BCD) file
3. Manually update the BOOTMGR File
4. Decompress drive.

Let’s take a look at the description of the process involved concerning each of the listed solutions.

1] Run Startup Repair

Since this BOOTMGR is compressed error is preventing your Windows 10 system from startup and boot fully to the desktop, the first logical step to take is to, perform Windows 10 Startup Repair. Run the Startup Repair three different times, because sometimes it takes three runs to fix it. If this does not fix your problem move on to the next option.

2] Rebuild Boot Configuration Data (BCD) file

This solution requires you to rebuild the Boot Configuration Data (BCD).

3] Manually update the BOOTMGR file

Since the boot error is often caused by a compressed BOOTMGR file, replacing the file is often a good and effective solution.

To manually update the BOOTMGR file, do the following:

Boot interrupt Windows 10 by starting your PC and as soon as you see the Windows logo; press and hold the power button to force a shutdown. Repeat this 2-4 times and Windows will open up the Advanced Startup Options menu for you.

Alternatively, if available, you can use the Windows 10 installation media to boot your PC into the Advanced Startup Options menu.

• At the Advanced Startup Options screen, select Advanced Options.
• Select Troubleshoot.
• Under Advanced options screen, select Command Prompt.
• Next, type cd\ and hit Enter.
• Now, type  C: and hit Enter.
• Next, type in the command below and hit Enter:

bcdboot C:\Windows /s D:\

Once the command executes, restart your computer and see if it boots successfully without the issue at hand. Otherwise, try the next solution.

4] Decompress/Uncompress drive

Since this error is often caused by a compressed hard drive, it is possible to fix it by decompressing or uncompressing the system drive.

To decompress/uncompress the drive, do the following:

• Boot into Advanced Startup Options using any of the methods in Solution 3 above.
• Access Command Prompt and change to the C directory as shown above.
• In the CMD prompt, type the command below and hit Enter:

compact /u /s /i *.*

Once the command executes, restart the computer. The issue should be resolved now.

Hope this helps!

Related post: Fix Bootmgr is Missing error in Windows 10.

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