Can't boot from usb drive

Pqqwetiqe

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May 24, 2015
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I have a lenovo laptop with Windows 10 installed on the hard drive. When booting with the hdd connected inside the computer - no problems.
When i try to boot from the same hdd on the same laptop, only connecting the hdd to the usb (with sata to usb 3 cable), i get the blue screen of death. Sometimes with the error message inaccessible_boot_device, somtimes with drive_irql_not_less_or_equal.
How can i fix it?