在您的 macOS 上使用Boot Camp 助理时，如果您收到错误消息 — Please format the USB drive as single FAT partition，那么这篇文章将帮助您解决问题。一些论坛用户报告说，即使使用磁盘实用程序将USB驱动器格式化为^(USB)FAT多次，它总是卡在需要选择目标磁盘的屏幕上。

请将^(Please)USB驱动器格式化为单个FAT分区

这里的问题是，当使用第三方实用程序  格式化USB驱动器时，没有^(USB)MBR记录，这是Boot Camp 助手^{(Boot Camp Assistant)}所需要的。将USB^(USB)驱动器格式化为FAT时，没有可用的MBR。因此解决方案是使用Master Boot Record或MBR格式化驱动器。但在我们继续之前，您需要检查一件事。

• 使用 Spotlight^{(Use Spotlight)}搜索打开磁盘工具^{(Disk Utility)}
• 选择USB驱动器，然后查看实用程序顶部是否有一个显示分区的操作按钮
• 如果它说的不是MBR，那么我们就有问题了。

按照 macOS 上的步骤使用MBR + FAT32

1]记下连接到mac的USB驱动器的名称。^(USB)它应该在桌面上可用。

2] 按^(Press)命令和空格键打开聚光灯。键入^(Type)终端，当它出现时，按Enter键将其打开。

3]在终端中输入diskutil list ，然后按回车键。您应该看到所有连接的驱动器的输出。其中之一将是USB驱动器。您可以通过名称来识别它。就我而言，我将其命名为AshishUSB。

   /dev/disk4 (external, physical):

   #: TYPE               NAME                   SIZE       IDENTIFIER

   0: GUID_partition_scheme     *16.2 GB    disk4
                  EFI EFI       
   1: Microsoft Basic Data AshishUSB        16.2 GB    disk4s1

仔细记下 USB 驱动器的路径，^{(note the path of the USB drive,)}在我的例子中是/dev/disk4. 我们将在下一步中需要它。

4]在终端上，执行以下命令，使用MBR格式化^(MBR)USB。

diskutil partitionDisk /dev/disk4 1 MBR fat32 ASHISHNEW 16GB

以下是它如何创建分区图并激活它的输出。

• 在disk4上开始分区
• 卸载磁盘
• 创建分区图
• 等待分区激活
• 将 disk4s1 格式化为MS-DOS ( FAT32 )，名称为ASHISHNEW
• 每个物理扇区 512 字节
• /dev/rdisk4s1：1979377 个FAT32簇中的 31670032 个扇区（8192 字节/簇）
• bps=512 spc=16 res=32 nft=2 mid=0xf8 spt=32 hds=255 hid=2048 drv=0x80 bsec=31700992 bspf=15464 rdcl=2 infs=1 bkbs=6
• 安装盘
• 在disk4上完成分区

/dev/disk4 (external, physical):

   #:  TYPE NAME             SIZE       IDENTIFIER

   0: FDisk_partition_scheme *16.2 GB    disk4

   1: DOS_FAT_32 ASHISHNEW   16.2 GB    disk4s1

最后一个输出是有区别的。在此输出中，有两个节点 — DeviceNodes：0，类型为FDisk_partition_scheme和 1，类型为DOS_FAT_32。由于我们使用了MBR fat32 作为参数，所以我们将使用MBR而不是GUID。

现在当您再次运行Boot Camp 助手^{(Boot Camp Assistant)}时，您将不会收到错误消息 —请将 USB 驱动器格式化为单个 FAT 分区^{(Please format the USB drive as single FAT partition)}。

我们最近谈到了使用 macOS 创建 Windows 10 可启动 USB 驱动器^{(Windows 10 Bootable USB drive using macOS)}，如果您遇到类似的错误，现在您知道应该做什么了。

Please format the USB drive as single FAT partition: Boot Camp Assistant

When using Boot Camp Aѕsistant on your macOЅ, if you receive an error saying — Please format the USB drive as single FAT partition, then this post will help you resolve the problem. Some of the forum users have reported that even though the USB drives were formatted multiple times using the disk utility as FAT, it always got stuck on the screen where one needs to select destination disk.

Please format the USB drive as single FAT partition

The problem here is that when formating USB drive using third party utility doesn’t  MBR record, which is needed by the Boot Camp Assistant. When formatting a USB drive as FAT, there is no MBR available. So the solution is to format the drive with Master Boot Record or MBR. But before we go ahead, here is one thing you need to check.

• Use Spotlight search to open Disk Utility
• Select the USB drive, and see if you have an action button on top of the utility which says Partition
• If it says anything other than MBR, then we have a problem.

Follow the steps on your macOS to format with MBR + FAT32

1] Note the name of the USB drive, which is connected to the mac. It should be available right on the desktop.

2] Press command and space bar to open the spotlight. Type terminal, and when it appears, press the Enter key to open it.

3] Type diskutil list in the terminal, and press the enter key. You should see an output of all connected drives. One of these will be the USB drive. You can identify it with the name. In my case, I had named it AshishUSB.

   /dev/disk4 (external, physical):

   #: TYPE               NAME                   SIZE       IDENTIFIER

   0: GUID_partition_scheme     *16.2 GB    disk4
                  EFI EFI       
   1: Microsoft Basic Data AshishUSB        16.2 GB    disk4s1

Carefully note the path of the USB drive, which in my case is /dev/disk4. We will need that in our next step.

4] On the terminal, execute the following command to format the USB with MBR.

diskutil partitionDisk /dev/disk4 1 MBR fat32 ASHISHNEW 16GB

Here is how the output where it creates the partition map and activates it.

• Started partitioning on disk4
• Unmounting disk
• Creating the partition map
• Waiting for partitions to activate
• Formatting disk4s1 as MS-DOS (FAT32) with name ASHISHNEW
• 512 bytes per physical sector
• /dev/rdisk4s1: 31670032 sectors in 1979377 FAT32 clusters (8192 bytes/cluster)
• bps=512 spc=16 res=32 nft=2 mid=0xf8 spt=32 hds=255 hid=2048 drv=0x80 bsec=31700992 bspf=15464 rdcl=2 infs=1 bkbs=6
• Mounting disk
• Finished partitioning on disk4

/dev/disk4 (external, physical):

   #:  TYPE NAME             SIZE       IDENTIFIER

   0: FDisk_partition_scheme *16.2 GB    disk4

   1: DOS_FAT_32 ASHISHNEW   16.2 GB    disk4s1

The last output is what makes the difference. In this output, there are two nodes—DeviceNodes: 0, of type FDisk_partition_scheme, and 1, of type DOS_FAT_32.  Since we have used MBR fat32 as a parameter, so we will have MBR instead of GUID.

Now when you run the Boot Camp Assistant again, you will not receive the error — Please format the USB drive as single FAT partition.

We recently talked about creating Windows 10 Bootable USB drive using macOS, and if you face a similar error, now you know what should be done.

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