The BIOS may fail to properly enumerate USB bootable devices, which results in a blue screen
and failure of USB boot. When troubleshooting USB boot failure, use the NTDETECT.COM tool
and the following procedure to verify that the BIOS properly enumerates USB bootable
devices.
To verify USB bootable devices
Boot the device.
The tool displays the bootable devices identified by the BIOS.
If bootable devices are found, the following output appears:
Enumerating Interrupt 13 disks found on this system
DriveSelect-MaxCylinders-SectorsPerTrack-MaxHeads-NumberDrives
<NNN>-<NN>-<N>-<NN>-<NNN>
...
<NNN>-<NN>-<N>-<NN>-<NNN>
Enumeration done. Press a key to continue...
where <NNN>-<NN>-<N>-<NN>-<NNN> represents the drive characteristics for each bootable
device.
If the BIOS fails to find any bootable devices, the tool displays failure reasons and
prompts the user to ignore and retry. Upon retry, the tool then enumerates any boot disks
found on the system with their drive characteristics.
Failure to find bootable devices may indicate a problem in any of the following areas:
BIOS
USB storage medium
motherboard
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