![]() ![]() ![]() ![]() How to determine whether the boot sector is FAT32, FAT16, or NTFSĬheck two strings in the boot sector to determine if the USB flash drive was formatted by using one of the following file systems: These signatures don't appear in the MBR. 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, see DiskPart Command-Line Options. However, the FAT32 startup code doesn't support this scenario. The BIOS tries to transfer the control of the startup from the USB flash drive to the FAT32 startup code. The FAT32 startup code doesn't 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 doesn't 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. This article works around a startup failure when you use a USB flash drive that's formatted to use the FAT32 file system.Īpplies to: Windows Server 2012 R2 Original KB number: 954457 Symptoms ![]()
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