您可能想从Windows驱动器上的可用空间创建分区的原因有很多。最常见的原因通常是安装不同的操作系统（如Linux），以便您可以双启动 PC。
其他原因可能包括创建一个与 C: 驱动器分开的新硬盘驱动器，该驱动器仅用于数据。或者，您可能想要创建一个加密分区，如果没有正确的安全密钥，任何人都无法访问该分区。
无论出于何种原因，您都不应该立即跳入流程。您应该做一些事情来确保您正确调整了新分区的大小，并且如果出现问题，您有一个后备计划。
创建 Windows 10 备份
如果您要使用安装了主要Windows 10操作系统的同一硬盘驱动器创建分区，则需要安全地执行此操作。
您的第一步应该始终是获取硬盘驱动器的备份映像。值得庆幸的是，这是一个非常容易启动的过程，但确实需要一些时间才能完成。留(Set)出大约一个小时来完成这个过程。
1. 要开始您的Windows备份，请打开控制面板(Control Panel)并选择备份和还原 (Windows 7)(Backup and Restore (Windows 7))。从左侧菜单中选择创建系统映像。(Create a system image)
2. 这将打开一个新窗口，您可以在其中选择要存储备份的位置。请记住，您的备份存储空间需要与您当前在 Windows 10 电脑上使用的空间量一样大。选择下一步(Next)继续。
3. 备份过程将需要 15 分钟到一个小时，具体取决于您的驱动器使用量。完成后，一个名为WindowsImageBackup的新驱动器将出现在您选择存储备份的位置。
您可能会注意到您无法查看此目录的内容。如果是这种情况，请选择Start，键入Explorer.exe，右键单击Explorer.exe 运行命令(Explorer.exe Run command)并选择Run as administrator。
现在您可以导航到备份文件夹并查看您的 Windows 10 备份是否成功完成。您现在已准备好将可用 PC 空间从主分区分配给另一个分区。
注意(Note)：如果出现问题并且您确实需要恢复Windows 10，您可以通过打开控制面板(Control Panel)并选择备份和还原 (Windows 7)(Backup and Restore (Windows 7))来恢复。选择选择另一个备份来恢复文件(Select another backup to restore files from)以选择您的备份并恢复您的系统。
阅读我们关于如何创建 Windows 10 系统映像备份(how to create a Windows 10 system image backup)的详细指南。
分配可用空间(Allocate Free Space)以创建分区
要从驱动器可用空间创建分区，您需要知道可以腾出多少可用空间。如果您在单个硬盘驱动器上运行Windows 10 ，其中仅为(Windows 10)Windows 10操作系统和所有数据文件分配了一个主分区，则需要确保在缩小该分区后仍有足够的空间。
要检查这一点，请打开File Explorer，右键单击主系统驱动器（在本例中为 C:），然后选择Properties。
在这里，您将看到已用空间和可用空间。
如果您希望使用Ubuntu Linux等新操作系统双启动 PC ，请确保可用空间能够满足新操作系统的最低要求。
例如，Ubuntu至少需要 25 GB。要为数据留出空间，您需要为Ubuntu OS分区分配大约 100 GB 的空间。
一旦你计算出你想要缩小主分区多少来为新分区腾出空间，你就可以创建你的新分区了。
1. 选择开始菜单并输入管理(Administrative)。选择Windows 管理工具应用程序(Windows Administrative Tools App)。管理工具(Tools)窗口打开后，选择计算机管理(Computer Management)。在“计算机管理(Computer Management)”窗口中，从左侧菜单中选择“磁盘管理”。(Disk Management)在这里，您将看到 C: 驱动器分区及其整体大小。
2. 右键单击 C: 分区并从下拉列表中选择Shrink Volume 。
3. 将弹出一个窗口，您可以在其中输入缩小所选分区的空间量。在Enter the amount of space to shrink in MB字段中，您需要输入所需新分区的大小。例如，如果您希望新分区为 200 GB，您将输入200000。完成后选择收缩(Shrink)。
4. Shrink操作完成后，您将看到一个新分区列为“未分配(Unallocated)”。
现在您已经将可用空间从一个分区分配到另一个分区，您可以将其用于您想要的任何目的。
使用新分配的分区
您将根据您的用途来以不同的方式处理这个未分配的空间。如果您只想将其用作新的数据存储空间，只需右键单击分区并选择New Simple Volume即可。
您可以将此作为扩展分区来存储数据。
如果您有兴趣使用它通过Ubuntu等Linux 操作系统(Linux OS)双启动 Windows 10 PC ，您可以浏览我们的使用 Ubuntu 双重启动 Windows 10(dual booting Windows 10 with Ubuntu)的指南。或按照我们的指南使用 Mint 进行双启动 Windows 10(dual boot Windows 10 with Mint)。
你也可以两者都做。如果您通过在新分配的分区中安装Linux(Linux)来创建双引导系统，则可以重复上述过程以创建第三个分区，该分区可以用作两个系统的共享数据存储。
您决定如何使用新分配的分区完全取决于您。
How To Create a Partition From Windows Drive Free Space
There are a lot of reаsons уou might want to create a раrtition frоm free space on уour Windows drive. The most common reason is usually to install a different operating system (like Linux) so you can dual boot your PC.
Other reasons may include creating a new hard drive separate from your C: drive that’s dedicated to only data. Or you might want to create an encrypted partition that no one can access without the correct security keys.
Regardless of the reason, you shouldn’t just jump into the process immediately. There are a few things you should do to make sure you’ve sized the new partition correctly, and that you have a fall-back plan if things go bad.
Create a Windows 10 Backup
If you’re about to create a partition with the same hard drive where your primary Windows 10 operating system is installed, you need to do it safely.
Your first step should always be to take a backup image of your hard drive. Thankfully this is a very easy process to initiate, but it does take some time to complete. Set aside about an hour to finish this process.
1. To start your Windows backup, open the Control Panel and select Backup and Restore (Windows 7). Select Create a system image from the left menu.
2. This will open a new window where you can select where you want to store the backup. Keep in mind that your backup storage needs to have available space that’s as large as the amount of space you’re currently using on your Windows 10 PC. Select Next to continue.
3. The backup process will take anywhere from 15 minutes to an hour depending how large your drive usage is. When it’s done, a new drive called WindowsImageBackup will appear where you’ve selected to store your backup.
You may notice that you can’t view the contents of this directory. If this is the case, select Start, type Explorer.exe, right click on Explorer.exe Run command and select Run as administrator.
Now you can navigate to the backup folder and see that your Windows 10 backup completed successfully. You’re now ready to allocate free PC space from your main partition to another one.
Note: If something goes wrong and you do need to recover your Windows 10, you can do so by opening the Control Panel, and selecting Backup and Restore (Windows 7). Choose Select another backup to restore files from to select your backup and restore your system.
Read our detailed guide on how to create a Windows 10 system image backup.
Allocate Free Space To Create a Partition
To create a partition from your drive free space, you need to know how much free space you can spare. If you’re running Windows 10 on a single hard drive where only one main partition is allocated for the Windows 10 OS and all data files, you’ll need to make sure you still have plenty of space left over after you shrink that partition.
To check this, open File Explorer, right-click the main system drive (in this example, that’s C:), and select Properties.
Here, you’ll see both Used space and Free space.
If you’re hoping to dual boot your PC with a new OS like Ubuntu Linux, make sure the free space can accommodate the minimum requirements of the new OS.
For example, Ubuntu requires at least 25 GB. To leave room for data, you’ll want to allocate around 100 GB for a Ubuntu OS partition.
Once you’ve calculated how much you want to shrink the main partition to make space for the new one, you’re ready to create your new partition.
1. Select the Start menu and type Administrative. Select the Windows Administrative Tools App. Once the Administrative Tools window opens, select Computer Management. In the Computer Management window, select Disk Management from the left menu. Here, you’ll see the C: drive partition and its overall size.
2. Right-click the C: partition and select Shrink Volume from the dropdown list.
3. A window will pop-up where you can enter the amount of space to shrink the partition you selected. In the field for Enter the amount of space to shrink in MB, you’ll need to enter the size of the new partition you want. For example, if you want the new partition to be 200 GB, you’ll type 200000. Select Shrink when you’re done.
4. Once the Shrink operation is completed, you’ll see a new partition listed as “Unallocated”.
Now that you’ve allocated free space from one partition to another, you’re ready to use it for whatever purpose you wanted it for.
Using Your Newly Allocated Partition
You’ll handle this Unallocated space differently depending what you want to use it for. If you’re only interested in using it as new storage space for data, just right-click the partition and select New Simple Volume.
You can make this an extended partition to store data.
If you’re interested in using it to dual boot your windows 10 PC with a Linux OS like Ubuntu, you can walk through our guide on dual booting Windows 10 with Ubuntu. Or follow our guide to dual boot Windows 10 with Mint.
You can also do both. If you create a dual boot system by installing Linux in a newly allocated partition, you could repeat the process above to create a third partition that can serve as shared data storage for both systems.
How you decide to use your newly allocated partition is completely up to you.
