Windows 10: Computer Will Not Reboot Into More Than One Drive

I have two internal and two external drives. I wanted to switch one internal drive's operating system, but the computer only boots into a single drive. System configuration and Disk Management detect all the drives. Changing boot order from BIOS does nothing.

:)

 

Power Outage or Reboot Resets Drive Letters

Thank you for the reply, but I would like some clarification on the suggested solution(s).

In running diskpart, I typed "LIST VOLUME" as suggested by Rover85. I noted that my D: drive is listed as volume 8 and my E: drive is volume 9.

Do I then continue in diskpart with Gavin Adams answer of 1/27/2013 with the following script?

LIST VOLUME

SELECT VOLUME 8 (and/or 9)

ATTRIBUTES VOLUME CLEAR HIDDEN

EXIT

And this will assign the appropriate drive letter on reboot?

The one thing that bothers me is that my first try after reboot with Computer Management/Disk Management would not connect to the "Virtual Disk Service" until I did a second reboot.

 

CD drive error

1) Close all open programs
2) Click on Start, Run, and type REGEDIT and press Enter
3) Click on the plus signs (+) next to the following folders

HKEY_LOCAL_MACHINE
SYSTEM
CurrentControlSet
Control
Class
{4D36E965-E325-11CE-BFC1-08002BE10318}
4) This folder is the DVD/CD-ROM Drive Class Description in the registry. Look for any of the following names in the right hand column.

UpperFilters
LowerFilters
UpperFilters.bak
LowerFilters.bak
5) If any of the above keys shown in step 4 are listed, right-click on them and choose Delete
6) After deleting the keys, close the Registry Editor
7) Reboot your computer
8) Open My Computer and check to see if your CD or DVD drives have returned. You may also want to open Device Manager and verify that the yellow exclamation and error code on the CD or DVD drive is gone.

And it likely has something to do with the emulated drive you have listed there.

 

Hard drive/ OS issue

a guy suggested :

• shutdown
• unhooked HDD
• restarted
• yay !!
• reconnected HDD
• restarted
• yay !!

also , try method 3
Drive Where Windows is Installed is Locked: How to Unlock It