A little trick the old man taught me wayyy back when Gates took over in a bloodless coup.......... ALWAYS format every drive
/s . It snookers MS products trying to decide where they want to default to.
We haven't had an op system on a C drive since he tore apart my Microcenter proprietary Laser in early 95. lol Nor have we had a MS product insist on the drive letter it will or will not install on.
Just make sure you keep notes on how many drives you have and where the drive letters are coming from in case you ever need to change a drive.
