如果您的USB驱动器在您的计算机上显示的大小错误，则可能是驱动器格式不正确造成的。而不是看到实际的 16GB 或任何大小的USB驱动器，您会看到它上有几百MB(MBs)的可用空间。
当您看到这一点时，请不要惊慌，因为您的驱动器上仍有原始可用内存空间。可能还有其他各种原因，例如您的计算机可能感染了病毒。
无论如何，重新格式化您的 USB 驱动器(reformatting your USB drive)应该可以为您解决问题，并且您将能够使用记忆棒上的全部可用空间。
使用 EaseUS Partition Master 修复 USB 驱动器大小错误的问题(Fix The USB Drive Wrong Size Issue With EaseUS Partition Master)
我们不使用系统右键菜单中的默认格式选项的原因是它有时无法解决此类问题。这是一个非常基本的工具，实际上并没有深入到实际发现错误并修复它。
另一方面， EaseUS Partition Master(EaseUS Partition Master)能够重新格式化您的驱动器并修复它们上的任何问题。
- 在您的计算机上下载、安装和启动EaseUS Partition Master 。
- 将USB驱动器插入计算机，它会出现在工具界面上。
- 单击(Click)列表中的驱动器，您将在右侧窗格中看到一个菜单。从菜单中的可用选项中，选择“全部删除”(Delete All)以删除驱动器上的所有分区。
- 完成删除驱动器上的所有分区后，右键单击驱动器并选择“创建(Create)”选项。它会让你创建新的分区。
- 在给定字段中输入(Enter)以下值，然后单击底部显示“确定”的按钮。(OK)
分区标签(Partition label)- 在此处输入任何名称
文件系统(File system)- 选择FAT32
驱动器号(Drive letter)- 选择要分配给USB驱动器的字母
确定大小和位置(Decide size and position)- 确保滑块覆盖驱动器的整个大小
格式化USB(USB)驱动器后，它会在您计算机上的“这台电脑(This PC)”中显示其全部容量。
使用 Bootice 解决 USB 驱动器容量错误的问题(Resolve The USB Drive Wrong Capacity Issue With Bootice)
如果您不想在计算机上安装工具来修复U(USB)盘容量错误的问题，您可以使用Bootice，这是一款无需安装的便携式工具。
您只需要从网站上获取该工具，启动它，指定一些选项，它就会立即修复您的USB驱动器。(USB)
从Softpedia(Softpedia)下载Bootice工具，解压缩存档文件，然后双击可执行文件以启动该工具。
将USB驱动器插入计算机，从工具的目标磁盘(Destination Disk)下拉列表中选择驱动器，然后单击部件管理(Parts Manage)。
将出现一个新屏幕，显示驱动器上的所有可用分区。你不需要对它们做任何事情——只需点击底部的重新分区按钮。(Re-Partitioning)
以下屏幕将让您指定您希望如何重新分区您的驱动器。选择以下选项，然后单击OK。
磁盘模式(Disk Mode)– 选择USB-HDD 模式（单分区）(USB-HDD mode (Single Partition))
文件系统(File system)– FAT32
卷标签(Vol Label)– 您可以在此处为您的驱动器输入任何名称
Start LBA – 输入1
Reserved Secs – 输入32
您将收到提示，警告您驱动器上的所有数据都将丢失。单击(Click)“确定(OK)”继续并格式化您的驱动器。
格式化完成后，您会发现您的计算机现在显示了USB驱动器的全部存储容量。
使用命令提示符修复大小不正确的 USB 驱动器(Fix An Incorrect Size USB Drive Using Command Prompt)
错误的USB驱动器大小问题也可以使用命令提示符(Command Prompt)修复。有一个命令可让您删除所有分区，格式化驱动器(format your drive)，然后在驱动器上重新创建分区。
打开开始菜单(Start Menu)，搜索命令提示符(Command Prompt)，在结果中看到它时右键单击它，然后选择以管理员身份运行(Run as administrator)。
在命令提示符(Command Prompt)窗口中键入以下命令，然后按 Enter(Enter)。它将启动磁盘实用(Disk Utility)程序的命令行版本。
磁盘部分(diskpart)
键入以下命令以查看连接到计算机的所有磁盘。您的 USB 驱动器将是这些磁盘之一。
列出磁盘(list disk)
要对驱动器执行操作，请运行以下命令，将N替换为(N)USB驱动器的实际编号。
选择磁盘 N(select disk N)
使用以下命令清理USB驱动器。
干净的(clean)
清理驱动器后，运行以下命令创建新分区。
创建分区主(create partition primary)
最后，使用以下命令将驱动器格式化为FAT32格式。
format fs=fat32 quick
格式化驱动器(your drive is formatted)后，您可能需要将其拔下，然后再将其重新插入计算机。然后，您会发现您的计算机允许您使用驱动器的全部存储容量。
How To Fix USB Drive Showing Wrong Size
If your USB drive is shown wіth a wrong size оn your computer, it’s likely the result of an improper formatting of the drive. Instead of seeing the actual 16GB or whatever the size of уour USB drive is, you’ll see something like a couple hundred MBs available on it.
When you see that, don’t panic because your drive still has the original amount of memory space available on it. There could be various other reasons as well such as maybe your computer is infected with a virus.
Regardless, reformatting your USB drive should fix the issue for you and you’ll be able to use the entire space available on your stick.
Fix The USB Drive Wrong Size Issue With EaseUS Partition Master
The reason we aren’t using the default format option found in the right-click menu of your system is because it sometimes doesn’t work to fix issues like this. It’s a very basic tool and really doesn’t go in-depth to actually find what’s wrong and fix it.
EaseUS Partition Master, on the other hand, has the capability to reformat your drives and fix any issues on them.
- Download, install, and launch EaseUS Partition Master on your computer.
- Plug in your USB drive to your computer and it’ll appear on the tool interface.
- Click on your drive in the list and you’ll see a menu appearing in the right-hand side pane. From the available options in the menu, select the one that says Delete All to delete all the partitions on your drive.
- When it has finished deleting all the partitions on the drive, right-click on your drive and select the option that says Create. It’ll let you create new partitions.
- Enter the following values in the given fields and then click on the button that says OK at the bottom.
Partition label – enter any name here
File system – choose FAT32
Drive letter – choose a letter you want to assign to your USB drive
Decide size and position – ensure the slider covers the whole size of the drive
When your USB drive is formatted, it’ll show up with its full capacity in This PC on your computer.
Resolve The USB Drive Wrong Capacity Issue With Bootice
If you don’t want to install a tool on your computer to fix your USB drive’s wrong capacity issue, you can use Bootice which is a portable tool that requires no installation.
You just need to get the tool from a website, launch it, specify a few options, and it’ll get your USB drive fixed in no time.
Download the Bootice tool from Softpedia, extract the archive files, and double-click on the executable file to launch the tool.
Plug in your USB drive to your computer, select the drive from the Destination Disk dropdown in the tool, and click on Parts Manage.
A new screen will appear showing all the partitions available on your drive. You don’t need to do anything to them – just click on the Re-Partitioning button at the bottom.
The following screen will let you specify how you’d like to re-partition your drive. Select the options as the following and click on OK.
Disk Mode – select USB-HDD mode (Single Partition)
File system – FAT32
Vol Label – you can enter any name for your drive here
Start LBA – enter 1
Reserved Secs – enter 32
You’ll get a prompt warning you all the data on the drive will be lost. Click on OK to continue and format your drive.
Once the formatting is complete, you’ll find that your computer now shows the full storage capacity of your USB drive.
Fix An Incorrect Size USB Drive Using Command Prompt
The wrong USB drive size issue can be fixed using Command Prompt as well. There’s a command that allows you to remove all the partitions, format your drive, and then re-create partitions on the drive.
Open the Start Menu, search for Command Prompt, right-click on it when you see it in the results, and select Run as administrator.
Type the following command into the Command Prompt window and hit Enter. It’ll launch the command-line version of the Disk Utility program.
diskpart
Type in the following command to view all the disks attached to your computer. Your USB drive will be one of these disks.
list disk
To perform an operation on your drive, run the following command replacing N with the actual number for your USB drive.
select disk N
Use the following command to clean up your USB drive.
clean
When the drive is cleaned, run the following command to create new partitions.
create partition primary
Finally, use the following command to format the drive to FAT32 format.
format fs=fat32 quick
Once your drive is formatted, you may need to unplug it and then plug it back into your computer. You’ll then find that your computer allows you to use the full storage capacity of your drive.
