Boot on USB system

Hi there,
Using HDC 8.2 SE, I would like to know and understand why I am not able to boot on an external USB SSD hard drive on which I "restored" a system/disk image with HDC.
The very same image made with HDC works/boots perfectly on a internal hard drive, but why I can't seem to be able to boot with an external USB hard drive? It starts to boot, then after 30s fails and tells me INACCESSIBLE_BOOT_DEVICE.
I'm on Windows 10 family up to date, Asus vivobook S410 laptop, on i7.
Any advice, adjustments or tips I should use with HDC? Or any settings to change in the Bios (I already tried everything I can I believe)?
Thanks!
JC
Using HDC 8.2 SE, I would like to know and understand why I am not able to boot on an external USB SSD hard drive on which I "restored" a system/disk image with HDC.
The very same image made with HDC works/boots perfectly on a internal hard drive, but why I can't seem to be able to boot with an external USB hard drive? It starts to boot, then after 30s fails and tells me INACCESSIBLE_BOOT_DEVICE.
I'm on Windows 10 family up to date, Asus vivobook S410 laptop, on i7.
Any advice, adjustments or tips I should use with HDC? Or any settings to change in the Bios (I already tried everything I can I believe)?
Thanks!
JC