I've added a 3TB drive to my system that's running Windows 10. It previously had a 120GB SSD and a 1TB HDD After adding the new drive and rebooting the machine, the new drive was recognised as Disk 0, and my SSD which was previously Disk 0 was re-numbered as Disk1 - as in pic below - I had already re-assigned drive letters to my installed drives, so that the new drive could be assigned Drive D I didn't want the new drive recognised as Disk 0 however, so I connected the SATA cable for that drive to a different port, rebooted, and this time the drive is recognised as Disk 2 - as in pic below, with my SSD reverting to Disk 0 Ideally I would like my new drive (letter D), to show as Disk 1 and my older drive (now letter E) to show as Disk 2 Is it just a matter of swapping over the data cables going to the drives? Or is it more involved than that? I know that everything will work as it is, but it would be nice to have the drives in alphabetical order as well as numerical. Bearing in mind the 3TB drive needs to be drive D, so re-assigning the drive letters won't get me what I want. Hope someone can advise.