A few months ago, the hard drive letters changed which has slowed down my PC's boot time and is creating a few storage issues (as my C: drive doesn't have enough storage - 120 GB SSD). I'd like to change my current C: and D: (460+ GB HDD) drives so my D: drive contain most of the files and my C: drive only contains windows files. Is there a way to do this as currently copy-paste is my best method which doesn't work all the time?