Hi, Using Ubuntu 12.04: I have a strange situation where a usb drive was initially mounted as /dev/sdb1 to a directory /ut. For several days data read-write to the drive was going just fine. Then suddenly all read-write stopped, with a Input/Output error, and while mount showed that /dev/sd1 was still mounted on /ut. Investigating further I found using blkid that the usb drive was now showing as /dev/sdc1. How can this happen? I first thought, may be the pc rebooted itself after a power failure and the drive got reassigned, but uptime showed it has been on for 49 days since last reboot. The problem only appeared today or yesterday. I can mount /dev/sdc1 elsewhere and everything seem to be still there. So somehow the usb drive got reassigned by itself. Any ideas how/why this happened? Daniel. -- dan062 <dan062@yahoo.com.au>