Windows 10: FIXED: Removed drive letter in disk management, now I can't boot into windows

I'm on Windows 10. I'm trying to replace the hard drives in my PC with SSDs because I think they are starting to fail. I copied the contents of my D drive to the new drive and then removed the drive letter from the old D drive. Note this drive does not have my OS on it. Windows would not boot after that, saying: 'Reboot and select proper boot device'. This is not a boot order issue, I've tried multiple orders in bios. I am able to get into command prompt with a bootable USB and reassign drive letters correctly but this does nothing. Each time I restart it reassigns the letters. I've also trie

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help. USB drive isn't assigned a drive letter.

Any usb flash drive I plug into my computer isn't assigned a drive letter. The physical drive shows in the "safely remove hardware" but it doesnt show up in disk management. I have tried to populate the volume thru the safely remove hardware properties window and it does pop up in the list but it doesn't stay there. This isn't a format or assign a letter problem. It's more complicated then that. Maybe one of the services needed for usb drive management was disabled? Suggestions needed. btw external usb harddrives work fine.

 

Remove Drive Letter Logistics

I've always used disk management to assign (CHANGE) a permanent drive letter on a couple of my USB external backup drives. That works like a charm for backup jobs that require a set drive letter destination. But I got to wondering exactly what the other
two disk management Options of ADD and REMOVE actually do.

In other words does REMOVE (as I've read elsewhere) take the Drive Letter currently assigned to the Drive and remove it from not only the drive, but also from the list (i.e. the drop down list) in disk management you see when you want to change a letter.
So that letter will no longer be available for assignment to any drive? What good does this accomplish?

Can I add this drive letter back to the list with the ADD Option? If not what does the ADD Option do?

I had previously though that REMOVE simply removed the letter assignment the disk and the letter would still be available in the disk management list. And the drive would just go back to being assigned the first available letter windows had from then on.

Appreciate any confirmations on what exactly the ADD and REMOVE do.

 

Partition management

Or at the very least, make sure that your hard drive boot order is correct, because it will take the first writable drive in the boot list to determine where to put the boot loader. As Jester suggested, pop the Windows install disk in, make sure your boot order is correct (or unplug the drive,) and run repair. It's really that simple.