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How to determine whether the boot sector is FAT32, FAT16, or NTFS These signatures do not appear in the MBR. More Information How to differentiate between the MBR and the boot sectorĬurrently, the Windows operating system uses signatures at offset 3 in the boot sector to determine whether the sector is a boot sector. To work around this issue, use the Diskpart command prompt utility to create and format the boot partition on the USB flash drive.įor more information about how to use Diskpart, click the following article number to view the article in the Microsoft Knowledge Base:ģ00415 A Description of the Diskpart Command-Line Utility
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The BIOS tries to transfer the control of the startup from the USB flash drive to the FAT32 startup code, even though the FAT32 startup code does not support this scenario. The FAT32 startup code does not support starting a computer from a super floppy disk without an MBR. The USB flash drive is treated as a super floppy disk. Therefore, the Windows operating system does not create a master boot record (MBR) on the USB flash drive when you format the flash drive to use the FAT32 file system. This issue occurs because the USB flash drive is listed as removable media. When you try to start the computer from this USB flash drive, the startup process stops responding, and the screen is black. You format a USB flash drive to use the FAT32 file system. You cannot start a computer from a USB flash drive that is formatted to use the FAT32 file system Symptoms