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#11
However - drive letters stick only in the operating system running at the time. In your case you have Windows on a HDD and you want to clone it to the SSD. After cloning - but still running Windows from the HDD you can assign the Windows partition on the SSD any drive letter you want EXCEPT C:. Then when you change the boot order to the SSD and actually run Windows from the SSD, the Windows partition on the SSD will change to C: and all your other HDDs and partitions will get new drive letters.
Likewise once you boot from Windows on the SSD - you can assign the old Windows partition on the HDD any drive letter you want EXCEPT C:. If you then go back and boot from the HDD - the Windows partition on the SSD will revert back to the drive letter you first assigned to it when you were running Windows from the HDD previously and your HDD Windows partition will be C:.
The partition that the current Windows is running from will almost 100% of the time get drive letter C: when Windows is loaded from it.