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how do i exclude USB external disk from boot block search

HP Compaq 6305
Microsoft Windows 10 (64-bit)

The system works fine until I connect an external disk using USB the system will not boot. The USB external drive works fine, I am able to read and manipulate all files etc. But if I attempt to boot the system with the USB drive connected . It gives the following and will not boot.

 

info unexpected I/O error has occurred    

File  \Boot\BCD

status 0xc00000e9

 

Unplug the drive from the USB and it works great again. How do I exclude the search for a boot block on the external USB connected drive? Or is that the problem?  

 

The system is not set for UEFI and I have tried to remove the USB from the BIOS boot sequence but clearly I am missing something.

 

I moved the external drive from an older Windows system if that is of any consequence.

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how do i exclude USB external disk from boot block search

>  I have tried to remove the USB from the BIOS boot sequence but clearly I am missing something.

 

I agree.

 

In the BIOS, the boot-sequence may have separate options for booting from a USB device (such as a memory-stick) versus booting from a USB-connected external disk-drive.

 

Also, the "boot priority" may list "groups", namely disk-drives, or optical drives, or removable drives, as separate groups.

If it does, open the "disk-drive" group, to see if the external disk-drive is listed in that group.

If it is, remove it, or re-order the priority of devices within that group, to move your internal disk-drive to the top of the group.

 

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