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Change Drive Letters With PowerShell (and DiskPart)
I wrote this PowerShell function to change drive letters with PowerShell and DiskPart. Other methods posted online utilize the Win32_Volume WMI class which is not available in Windows XP. Using DiskPart makes the function compatible with Windows XP/2003 as well as Vista/2008/7.
Also, note the method used to detect whether or not a drive exists. I use this method vs. Test-Path as Test-Path can return (what I consider) False-Falses. If you run Test-Path on a CD-ROM or other drive letter without any media, it will return False even though the drive letter itself is in use.