Dan062 via luv-main wrote:
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.
I have never been too impressed with the stability of USB networks;
they seem OK providing nothing changes but plug/unplug a device,
and device numbers may stay the same; but often they don't.
Which can be really annoying given USB devices 'hot-swap'capability;
is often why they are used !
Is it possible some change occurred in the USB network ?
Did " /dev/sdb1" have the same USB device-number as" /dev/sdc1" ?
Whilst trying to understand USB device number 'transitions' I came
across the following;
which is not quite the same problem but seems simillar;
http://askubuntu.com/questions/333561/why-does-an-external-usb-hub-show-up-under-different-usb-bus-port-numbers-than-o
regards Rohan McLeod
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