Alright so I don’t exactly know where/how I’d start trying to figure out how to mount a drive containing a previous Linux install under a new Linux install on another HDD, but I have something else you can try…
-
You’ll need either a blank DVD or USB flash drive (preferably blank) with at least 2GB free space available. What you’re going to do is basically create and use a Ubuntu (Linux) LiveCD to transfer the data from the old drive to the new one…download either Ubuntu 14.04.4 or 15.10 from here and when you’re done, write the image to the flash drive/DVD (I assume you know how to already, being that you did it twice for MineOS) and when that’s complete, you’ll want to boot the server from the drive.
-
From the boot menu, select “Try Ubuntu” and wait for the LiveCD to boot. Next you’ll want to identify which drive is which (they should mount automatically after loading, and you can browse their directories to identify which is which) but from there you’ll be copying the last archives from the old drive’s archive folder directly to the new drive’s import folder.
-
You can also copy any other files you need from the drive, but you should drag them to the flash drive and not from one HDD to another, being that it can cause permission errors (based on another post) but you can drag from HDD to flash drive then from flash drive to HDD to help avoid that problem. Good luck!