如果您遇到 SD 卡或USB驱动器突然在磁盘管理^{(Disk Management)}中显示为未分配甚至停止在 Windows 11/10 PC 上工作的问题，那么这篇文章旨在帮助您。在这篇文章中，我们将确定此错误的可能原因，并提供您可以尝试的解决方案，以帮助纠正USB驱动器或 SD 卡上的未分配空间错误。

未分配空间^{(Unallocated space)}是由于文件删除不正确和病毒攻击而发生的错误。例如，您可能不小心删除了USB或 SD 卡上的分区，或者某些恶意程序为您执行此操作。尝试将系统刻录到USB驱动器后，也可能出现未分配空间。某些操作系统，例如Chrome OS和Linux ，会改变您的可移动设备的分区系统，因此您的^(Linux)USB驱动器上的可用空间很少。不恰当地使用某些第三方软件或格式化不成功也可能导致USB上的部分无法访问^(USB)驱动器或 SD 卡，显示为未分配空间。

USB驱动器或 SD 卡上的未分配空间^(Space)错误

如果您遇到USB 驱动器或 SD 卡上的未分配空间^{(Unallocated Space on USB drive or SD card)} 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. 使用磁盘管理
2. 使用 HPUSBDisk 工具
3. 使用磁盘部分

让我们看一下与列出的每个解决方案相关的过程的描述。

1]使用磁盘管理

要使用磁盘管理解决USB 驱动器或 SD 卡上的未分配空间^{(Unallocated Space on USB drive or SD card)}错误，请执行以下操作：

• 按Windows键 + X 打开高级用户菜单^{(Power User Menu)}。
• 按键盘上的 K^{(Press K)}打开磁盘管理^{(Disk Management)}。
• 在窗口的中央屏幕上，查找您的USB磁盘。它应该是Disk 1。
• 如果您的USB驱动器顶部显示黑色丝带，则右键单击它并选择New Simple Volume。
• 按照屏幕上的说明完成该过程。

之后，检查问题是否已解决。如果没有继续下一个解决方案。

2]使用HPUSBDisk工具

如上所述使用磁盘管理可能不适用于每个损坏的^{(Disk Management)}USB。在这种情况下，您应该尝试使用HPUSBDisk工具对其进行格式化。它是修复损坏的 USB 的非常强大的工具^(USBs)。

要使用此工具尝试修复USB 驱动器或 SD 卡上的未分配空间^{(Unallocated Space on USB drive or SD card)}错误，请执行以下操作：

• 下载^{(Download the)}HP USB 磁盘格式化工具。
• 右键单击^{(Right-click)}下载的工具并选择Run as Administrator。
• 选择您的USB或 SD 卡，然后单击开始^(Start)。

如果操作完成但错误仍未解决，请尝试下一个解决方案。

3]使用磁盘部分

要使用 DiskPart 回收USB 驱动器或 SD 卡上的未分配空间^{(Unallocated Space on USB drive or SD card)}，请执行以下操作：

在开始之前，请 备份数据，因为对^{(back up data)}DiskPart的错误操作可能会导致数据永久丢失。

• 将出现问题的USB驱动器或 SD 卡插入计算机。
• 按 Windows 键 + R。
• 在“运行”对话框中，键入diskpart并按CTRL + SHIFT + ENTER组合键以在命令提示符^{(Command Prompt)}提升/管理员模式下打开DiskPart 。
• 现在。键入列表磁盘^{(list disk)}并按 Enter。
• 接下来，输入Select disk 1（这个数字应该属于您的磁盘）并按Enter。
• 接下来，键入clean并按Enter以删除所选磁盘（即USB驱动器或 SD 卡）上的所有卷和分区。
• 现在键入create partition primary并按Enter创建主分区。

如果要在U^(USB)盘上创建多个分区，可以参考以下语法指定分区大小：

create partition primary [size=n]

例如，要创建一个 3000MB 的分区，请运行以下命令：

create partition primary size=3000

成功创建分区后，您可以轻松格式化USB驱动器或 SD 卡上的未分配空间。

完成后，您可以检查问题是否已解决。

Hope this helps!

Fix Unallocated Space error on USB drive or SD card in Windows 11/10

If you’re faced with the problem that your SD card or USB drіve suddenly shоws as unallocated in Disk Management or even stops working on your Windows 11/10 PC, then this post is intended tо helр you. In this post, wе will identify the possible causes of this error аnd аlso present the solutions you can try to help redress the unallocated spacе error on yoυr USB drive or SD card.

Unallocated space is an error that occurs because of incorrect deletion of files and virus attacks. For example, you may accidentally have deleted the partition on the USB or SD card or some malicious program does this for you. The unallocated space could also occur after trying to burn a system to the USB drive. Some operating systems, such as Chrome OS and Linux, will change the partition system of your removable device, so there will be little free space on your USB drive. Using some third party software inappropriately or unsuccessful formatting may also cause an inaccessible portion on your USB drive or SD card, which is shown as unallocated space.

Unallocated Space error on USB drive or SD card

If you’re faced with the Unallocated Space on USB drive or SD card issue, you can try our recommended solutions below in no particular order and see if that helps to resolve the issue.

1. Use Disk Management
2. Use HPUSBDisk tool
3. Use DiskPart

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

1] Use Disk Management

To use Disk Management to resolve the Unallocated Space on USB drive or SD card error, do the following:

• Press Windows key + X to open Power User Menu.
• Press K on the keyboard to open Disk Management.
• On the center screen of the window, look for your USB disk. It should be Disk 1.
• If your USB drive shows a black ribbon on top then right-click on it and select New Simple Volume.
• Follow the onscreen instructions to complete the process.

Afterward, check to see if the issue is resolved. If not continue with the next solution.

2] Use HPUSBDisk tool

Using Disk Management as described above might not work for every corrupted USB. In which case, you should try to format it with HPUSBDisk tool. It is a very powerful tool for fixing corrupted USBs.

To use this tool to attempt to fix the Unallocated Space on USB drive or SD card error, do the following:

• Download the HP USB Disk format tool.
• Right-click on the downloaded tool and select Run as Administrator.
• Select your USB or SD card and click on Start.

If the operation completes and the error is still unresolved, try the next solution.

3] Use DiskPart

To use DiskPart to reclaim the Unallocated Space on USB drive or SD card, do the following:

Before you get started, back up data because incorrect operations with DiskPart may cause permanent data loss.

• Plug in the USB drive or SD card you are having the problem with to your computer.
• Press Windows key + R.
• In the Run dialog box type diskpart and press CTRL + SHIFT + ENTER key combo to open DiskPart in Command Prompt elevated/admin mode.
• Now. type list disk and hit Enter.
• Next, type Select disk 1 (this number should belong to your disk) and hit Enter.
• Next, type clean and hit Enter to delete all volumes and partitions on the selected disk, which is the USB drive or SD card.
• Now type create partition primary and hit Enter to create a primary partition.

If you want to create more than one partition on the USB drive, you can specify the partition size referring to the following syntax:

create partition primary [size=n]

For example, to create a 3000MB partition, run the command below:

create partition primary size=3000

Once you have successfully created the partition, you can easily format unallocated space on the USB drive or SD card.

When done, you can check to see if the issue is resolved.

Hope this helps!

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