Morning folks I have just done a complete new install on a new drive , That is all working now fine . My problem comes when trying to include another drive on the system , it just refuses to boot fully , I get a message unable to mount sda2 now sda2 mounts , /dev/sda2 on / type xfs (rw,relatime,attr2,inode64,noquota) when just the one drive is in the system but as soon as i connect it refuses to to boot fully and drops out to an emergency shell that is locked up solid i. I have set the working drive in the bios this is an older motherboard with an AMD Phenome quad core CPU . $ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 1.8T 0 disk ├─sda1 8:1 0 300M 0 part /boot ├─sda2 8:2 0 40G 0 part / ├─sda3 8:3 0 4G 0 part [SWAP] └─sda4 8:4 0 1.8T 0 part /home sr0 11:0 1 1024M 0 rom the drive order in the bios is set correctly not that it makes much difference these days . I am stuck right now i need to be able to include the old drive to recover data from it . Any ideas folks .. Pete .