在极少数情况下，您可能会在安装更新^(Update)后发现文件资源管理器^{(File Explorer)}中缺少驱动器号^{(Drive letter is missing)}。如果您在 Windows 10 PC 上遇到此问题，可以通过以下方法解决此问题。

驱动器号代表单个字母字符（通常通过 AZ），可以分配给以下 -

物理磁盘分区
软盘驱动器
计算机中的可移动设备/ CD-ROM/映射网络驱动器。

Windows 10 中缺少驱动器号

通常，驱动器号 C: 分配给安装运行Windows的第一个磁盘分区。因此，如果Windows 文件资源^{(Windows File Explorer)}管理器或磁盘管理^{(Disk Management)}中缺少此固定驱动器号，可能会造成不便，甚至使分区无法访问。如果缺少 C 或D 驱动器^{(D Drive)}号，则要解决此问题，您可以：

手动显示缺少的驱动器号
确保您的驱动器具有在磁盘管理中分配的驱动器号^{(Disk Management)}
^(Assign)通过注册表^(Registry)调整分配字母
更新磁盘驱动器驱动程序
运行硬件疑难解答。

上述步骤可以帮助您找回丢失的驱动器号。

1]手动显示丢失的驱动器号^{(Manually Show Missing Drive Letters)}

缺少驱动器号

从开始^(Start)搜索中，打开文件夹^(Folder) 选项^(Options)并单击“查看^(View)”选项卡。

向下滚动^(Scroll)选项列表，直到看到“显示驱动器^{(Show drive letters)}号”选项。只需^(Simply)选中针对此选项标记的框。

单击“应用^(Apply)”，然后单击“确定^(OK)”。

现在，回到“这台电脑”窗口。您的驱动器号应该是可见的。

2]确保驱动器在^(Ensure)磁盘管理^{(Disk Management)}中分配了驱动器号

缺少驱动器号

在磁盘管理^{(Disk Management)}中，每个驱动器都分配了一个驱动器号，但如果它丢失了，在Windows 磁盘管理^{(Windows Disk Management)}中，您可以找回它。

当您右键单击分区（卷）的菜单时，会出现一个功能“更改驱动器号和路径”。^{(Change Drive Letter and Paths)}它可以帮助你——

添加驱动器号
更改驱动器号
删除驱动器号

如果选择并应用最后一个选项，即“删除^(Remove)”，则目标驱动器的盘符将被删除并在“磁盘管理^{(Disk Management)}”中消失。这可能是缺少驱动器号的原因之一。

因此，要撤消此更改，请选择“添加^(Add)”为所选驱动器分配一个字母。必须为驱动器分配原始字母 - 因为如果没有，那么依赖原始字母的程序可能无法按预期工作。如果原始盘符被新驱动器占用，请将新盘符更改为另一个可用盘符，然后将释放的盘符分配给目标驱动器。

3]通过注册表^(Registry)调整分配字母^(Assign)

启动注册表编辑器^{(Registry Editor)}并导航到 -

HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices

查看设备是否显示为安装在特定驱动器号。

接下来，右键单击您想要的驱动器号，然后从右键单击菜单中选择“重命名”以将字母更改为任何其他未使用的字母。^(Rename)

阅读^(Read)：如何在 Windows 10 中更改驱动器号。

4]更新磁盘驱动器驱动程序

Windows 10 中缺少 C 或 D 驱动器号

从WinX 菜单^{(WinX Menu)}中，打开设备管理器^{(Device Manager)}，展开磁盘^(Disk)驱动器，右键单击您的硬盘^{(Hard Disk)}并选择更新^(Update)，以更新设备驱动程序^{(update the device driver)}。

5]运行硬件疑难解答

从疑难解答页面运行硬件疑难解答，看看是否有帮助。

Hope something helped!

C or D Drive letter missing in Windows 10

On rare occasiоns, you may find that the Drive letter is missing from File Explorer following the installation of an Update. If you have experienced this issue on your Windows 10 PC, here’s a way to get past the problem.

A drive letter represents a single alphabetic character (typically through A-Z) that can be assigned to the following-

Physical disk partition
Floppy disk drive
Removable device/ CD-ROM/ mapping network drive in the computer.

Drive letter missing in Windows 10

Generally, drive letter C: is assigned to the first disk partition where the running Windows is installed. So, if this fixed drive letter is missing from either Windows File Explorer or Disk Management, it can cause inconveniences or even makes the partition inaccessible. If C or D Drive letter is missing, then to fix this issue, you can:

Manually Show Missing Drive Letters
Ensure your drive has a drive letter assigned in Disk Management
Assign the letter via a Registry tweak
Update Disk Drives Driver
Run Hardware Troubleshooter.

The above steps can help you to get the missing drive letter back.

1] Manually Show Missing Drive Letters

Missing Drive letter

From the Start search, open Folder Options and click the ‘View’ tab.

Scroll down the list of options until the ‘Show drive letters’ option is seen. Simply check the box marked against this option.

Click ‘Apply’, then ‘OK’.

Now, go back to the ‘This PC’ window. Your drive letters should be visible.

2] Ensure drive has a drive letter assigned in Disk Management

Drive letter missing

In Disk Management, every drive is assigned a drive letter, but if it is missing, In Windows Disk Management, you can get it back.

There’s a function ‘Change Drive Letter and Paths’ that appears when you right-click menu of a partition (Volume). It helps you to-

Add the drive letter
Change the drive letter
Remove the drive letter

If the last option, i.e., ‘Remove’ is selected and applied, the letter of the target drive will be removed and disappear in Disk Management. This can be one of the reasons for missing a drive letter.

So, to reverse this change, choose ‘Add’ to assign a letter to the selected drive. It is essential to assign the drive with the original letter – because, if not, then the programs relying on the original letter might not work as desired. If the original letter is taken by a new drive, change the letter of the new drive to another available letter and then allocate the released letter for the target drive.

3] Assign the letter via a Registry tweak

Launch Registry Editor and navigate to-

HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices

See if a device is shown as being mounted at the specific drive letter.

Next, right-click the drive letter that you want and choose “Rename” from the right-click menu to change the letter to any other unused letter.

Read: How to change Drive letter in windows 10.

4] Update Disk Drives Driver

C or D Drive letter missing in Windows 10

From the WinX Menu, open Device Manager, expand Disk drives, right-click on your Hard Disk and select Update, to update the device driver.

5] Run Hardware Troubleshooter

Run the Hardware Troubleshooter from the Troubleshooters Page and see if it helps.

Hope something helped!

宁史

About the author

在商业和技术方面，Windows 10 和 Windows 11/10 是非常重要的工具。它们使您可以比以往更轻松、更安全地与计算机交互，并运行功能强大但可自定义的应用程序，而不会带来任何安全风险。这些工具对于希望能够扩大其在线业务并吸引新客户的企业来说也是必不可少的。因此，我会说我在 Windows 10 和 Windows 11/10 方面的技能使我成为此类工作或业务的理想人选。

Windows 10 中缺少 C 或 D 驱动器号

Windows 10 中缺少驱动器号

1]手动显示丢失的驱动器号^{(Manually Show Missing Drive Letters)}