If you did everything described above, and your Windows still doesn’t boot, you will have to restore the Windows bootloader and disk boot record. They may have been changed (check if Windows is booted with the Secure Boot mode enabled/disabled and in the Legacy mode).
Your hard drive with the OS is connected to your computer (disconnect all other drives and USB devices: this is what you are advised to do in the first screenshot).An HDD with the installed OS is not connected (it may include such problems as poor ribbon cable connection, any hardware issues with the drive, RAID or disk controller).A corrupted boot configuration data (BCD).A damaged system partition, missing or damaged MBR (master boot record), no active partition (or an incorrect disk partition is marked as active).The most common reasons why an OS cannot boot with the “ Operating system not found” error are: Details on the differences between the modes can be found in this KB article.Common Reasons of “Operating System not Found” Error
Recreate the UFD with MakeDisk and select a different USB Mode for it.Change the BIOS "USB emulated mode" to "Hard Disk" (HDD) instead of "Floppy Disk" (FDD).Next, try the following troubleshooting steps: Note that on most newer computers, USB devices are usually displayed in the Hard Disk section of the boot order lists. By reviewing this information, you should be able to determine the type of USB device the BIOS supports. Depending on the BIOS, USB devices may be generic (USB FDD, USB HDD, USB CD) or they may be listed by their device name. The BIOS does not properly support booting the UFD in its current format.įirst, verify the types of USB devices from which the computer supports booting. A USB Flash Drive (UFD) is created using MakeDisk, but attempting to boot it fails or errors.
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