Simply put -- when you plugged the disk into the other machine it wrote to the disk. You should have reset the BIOS before plugging the disk back into the original machine and run fsck on the disk before booting which would have allowed you to use apt to change any firmware or system configurations that had changed from original ahead of new boot. Swapping disks between machines is not always automatically configurable. --
* Also for future reference if you are content to keep swapping the disk between machines --ordinary user files that you copy to the disk should be on a separate partition, as well as backups, and any OSs on the disk -- each on their own partition. Then you will not have permission errors to open and copy files or access backups. As far as a disk with an OS installed I/O usually takes ownership of any drive you plug into SATA 1 or 2 because of RAM type differences and -- depending on the MOBO after boot changes will write to the disk.
* Also Linux maps external drives in a disk caddy differently, either via USB or your network card under ethernet, which allows you to plug in multiple machines to external drives without permission errors.
TC
* Also for future reference if you are content to keep swapping the disk between machines --ordinary user files that you copy to the disk should be on a separate partition, as well as backups, and any OSs on the disk -- each on their own partition. Then you will not have permission errors to open and copy files or access backups. As far as a disk with an OS installed I/O usually takes ownership of any drive you plug into SATA 1 or 2 because of RAM type differences and -- depending on the MOBO after boot changes will write to the disk.
* Also Linux maps external drives in a disk caddy differently, either via USB or your network card under ethernet, which allows you to plug in multiple machines to external drives without permission errors.
TC
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.