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Failed to start Windows 10 with the acronis copy disk connected

That's what happens to my PC. For now I have disabled in the bios the boot from usb, because if I disconnect the disk with the backups of acronis if it starts normally. Does anyone know what I have to do? Thank you.

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Erredose, welcome to these User Forums.

If your BIOS was set to boot from USB and you have your USB backup drive connected via USB, then the computer will look for a bootable OS on that drive.  Normally it should not find an OS and continue to boot into Windows, but this may depend on how your Boot priority / boot sequence is configured in the BIOS also.

If your external backup drive has ever had an OS installed, then there may be enough left-over data from that OS (in the MBR / boot sector) that the computer will try to boot from the drive and fail for that reason.  

In reply to by truwrikodrorow…

Yes. It was because of that. The disk had been to install an OS and formatting with windows did not delete those partitions. Thank you very much.