当您的硬盘驱动器开始填满时，您不必通过文件资源管理器来查看正在使用空间的内容。您可以使用磁盘空间分析器扫描驱动器（或单个文件夹）并准确查看哪些文件夹和文件正在使用空间。然后，您可以就删除哪些内容并快速释放空间做出明智的决定。
这些工具与磁盘清理应用程序不同，后者会自动删除临时文件和缓存文件。分析器只会扫描您的驱动器，让您更好地了解空间使用情况，以便您清理磁盘空间。
WizTree 是我们目前最喜欢的用于分析磁盘空间的工具。它的主要优势是速度。与我们测试的其他程序相比，它极其快。扫描 1 TB NVMe SSD 只需要 5 秒，扫描 2 TB（大部分已满）机械硬盘只需要 6.1 秒。
用户界面非常用户友好。您在顶部选择要分析的驱动器，然后点击扫描。分析您的驱动器将需要几秒钟到几分钟的时间，具体取决于您的电脑和驱动器的大小和速度，然后您将能够在树视图（这是树形视图中的彩色视图）之间进行选择。上面的屏幕截图）或文件视图，它为您提供各个文件的更详细视图。如果单击树视图中的文件，它将提供有关该文件的更多信息，例如位置和大小，并且您可以右键单击某个块以获取其他选项。文件视图可让您找到重复的文件、按名称或大小搜索文件，以及一些您可能会觉得有用的其他选项。
WizTree 还在 Windows 10 和 Windows 11 中的右键单击上下文菜单中添加了一个选项，如果您想在不扫描整个驱动器的情况下获得单个文件夹的详细信息，这将非常有用。
它既可以作为安装程序，也可以作为便携式应用程序使用，如果您想将其加载到 USB 驱动器上以便随身携带以进行上门故障排除，这会很方便。
WinDirStat 是最佳存储空间分析软件的有力竞争者。其界面使您可以一目了然地准确了解硬盘驱动器上的空间使用情况。当您启动 WinDirStat 时，您可以让它扫描所有本地驱动器、单个驱动器（例如 C: 驱动器）或计算机上的特定文件夹。
扫描完成后，您将看到三个窗格。顶部有一个目录列表，按降序显示使用最多空间的文件夹。底部有一个“树形图”
视图，向您显示正在使用空间的颜色编码视图。右侧有一个文件扩展名列表，显示有关哪些文件类型使用最多空间的统计信息。它还用作图例，解释窗口底部出现的颜色。
例如，当您单击目录列表中的某个目录时，您将看到该目录的内容在树状图中突出显示。您可以将鼠标悬停在树状图中的某个方块上以查看它代表的文件。您还可以单击列表中的文件扩展名，以准确查看该类型的文件在树形图视图中的位置。右键单击目录列表中的文件夹，您将看到用于快速删除该文件夹或在资源管理器中打开它的选项。
WinDirStat 在其网站上不提供便携式应用程序，但如果您想随身携带并在各种电脑上使用它而无需先安装，则可以从 PortableApps.com 下载 WinDirStat 的便携式版本。
如果您正在寻找不同的东西，请尝试 SpaceSniffer。 SpaceSniffer 没有 WinDirStat 中包含的目录列表。它只是一个图形视图，按相对大小显示文件夹及其中的文件，就像 WinDirStat 界面中的底部树形图视图一样。
但是，与 WinDirStat 的树形图不同，您可以双击此界面中的文件夹以图形方式向下钻取。因此，如果您的“C:UsersNameVideos”目录中有一堆文件占用空间，您可以依次双击每个目录进行深入分析，最终右键单击文件或文件夹以访问“删除”和“打开”等选项。
In WinDirStat, you can only drill down through the directory list---not graphically through the treemap view. You'd have to start a new scan of a specific folder to get a new graphical view.
WinDirStat seems more practical, but SpaceSniffer does have the best graphical view. If you don't care about the directory list, SpaceSniffer is the tool for you. It runs as a portable application, too.
SpaceSniffer might have issues scanning certain folders unless you run it as administrator.
If you want something simpler than WinDirStat, TreeSize Free is a good alternative. It provides you with the same directory list and treemap interfaces you'll see in WinDirStat, but it doesn't have WinDirStat's file extension list, and its ribbon-style interface is a little more at home on modern versions of Windows than WinDIrStat's toolbar. TreeSize Free also adds a convenient scan option to Explorer, so you can right-click any folder in File Explorer and Windows Explorer and select "TreeSize Free" to scan its contents.
To view a treemap in TreeSize Free, click View > Show Treemap. As in the other applications here, you can right-click files or folders in the application to delete or open them.
While there are paid TreeSize Personal and TreeSize Professional applications, these just add bonus features like the ability to search for duplicate files, which other tools do just fine. You can scan and visualize your disk space using the free version of TreeSize with no problem.
This application is also available as a portable application, so you don't have to install it before running it, if you prefer.
Windows 10 and Windows 11 have a storage usage tool that may help you in some cases. It's not a classic disk space analyzer like the above tools, but it does have some similar features.
To access it, head to Settings > System > Storage and click a drive. You'll see a list of things taking up space on that drive, from apps and games to system files, videos, photos, and music. Click a category and Windows will suggest things you can remove---for example, you'll see a list of installed applications which you can sort by the space they take.
While this tool isn't as powerful as the above ones, it can be helpful for quickly understanding disk usage and freeing space in a pinch.
Once you've identified what is using up all your space, it is a simple matter to free up space. All of the third-party apps we listed allow you to easily open Explorer folder or open a file directly to check out what it is. Just right-click, then click "Open" or "Explorer Here" in the case of WinDirStat or WizTree. You can then delete files as you would normally. Make sure to double check what you're deleting though.
Modern versions of Windows—namely Windows 10 and Windows 11—will have a ton of stuff written to the AppData subfolders. They're often named strangely, too, so you may not recognize them at first glance. You can't safely delete the 20 GB folder you see hanging out in Local without first verifying what it is, and what it does. In all likelihood, it is a folder created by a piece of software you installed, and you're better off uninstalling it properly than just deleting the folder.
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