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Knowledge Base > Products > Image for DOS > Problem Solving > Unable to Boot Image for DOS from a USB Flash Drive

Unable to Boot Image for DOS from a USB Flash Drive

Problem:

A USB Flash Drive (UFD) is created using MakeDisk, but attempting to boot it fails or errors.

Missing TBOSLDR

Cause:

The BIOS does not properly support booting the UFD in its current format.

Solution:

First, verify the types of USB devices from which the computer supports booting. Depending on the BIOS, USB devices may be generic (USB FDD, USB HDD, USB CD) or they may be listed by their device name. By reviewing this information, you should be able to determine the type of USB device the BIOS supports. Note that on most newer computers, USB devices are usually displayed in the Hard Disk section of the boot order lists.

Next, try the following troubleshooting steps:

  • Change the BIOS "USB emulated mode" to "Hard Disk" (HDD) instead of "Floppy Disk" (FDD).

  • Recreate the UFD with MakeDisk and select a different USB Mode for it. Details on the differences between the modes can be found in this KB article.

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