USB drive disappears under 8.1 with 2.6.27-11 kernel
 

I have a Maxtor One touch external hard drive (powered), formated as ext3, which is my external backup device. It ran successfully under earlier versions of Ubuntu, through several upgrades until my Mobo/Graphics died.

The new Mobo prompted me to upgrade to 8.04 (yes, I'm a slacker but this is mainly the household server). This went fine, everything working including external USB drives. Sadly graphics card sucked and based on forum comments I upgraded onward to 8.1 and 2.6.27.

Graphics now wonderful. USB drives less so. The drive which used to pop up happily as sdc /media/Backup no longer registers properly. I thought it was just an automount problem and that I could manually mount it but the kernel doesn't seem to pick up the table at all (I have tried hotplugging and rebooting with disk plugged in, also using different USB sockets in case of basic issue in new Mobo).

The disk itself works fine plugged into other machines, other USB drives are similarly no longer recognised. USB mouse works.

lsusb output:

sudo fdisk -l output showing both the internal HDDs:
dmesg output at point where drive is plugged in:
I can manually recreate /media/Backup but I can't mount the drive as the kernel doesn't seem to recognise it/ "Too big adjustment 32" is a new message to me and googling seems to associate it with sound rather than USB drives.

I've seen some suggestions for modifying the kernel code directly but I would rather find a work around or official patch that muck around with code I don't fully understand. I haven't cross posted to the hardware forum but will if recommended, it is cross posted to Ubuntu support under the same title for those of you experiencing the same issues. Any suggestions for workarounds appreciated!

i had a similar situation and the following worked for me...

get root first, then
after making the directory, add a line to /etc/fstab with the following...

/dev/sda1 /mnt/max1 ext3 users,rw 0 0

where /dev/sda1 is the first unused SCSI device in your fstab file

Also try right clicking the drive -> properties -> [mounting] and uncheck "mount as user"

Let me know if this helps

I tried recreating the mountpoint (in my case I was using /media/Backup) and adding
/dev/sdc /media/Backup ext3 users, rw 0 0
(/dev/sdc was the assignment previously working )

If I then try to mount it I get the message saying it can't mount special device - it simply doesn't seem to see the device and the identification messages don't appear in dmesg/syslog (none of the usual messages relating to 'Maxtor One Touch' or 'mass storage device'.

The only place it is visible is via 'lsusb' and since the system doesn't detect it normally I can't use the normal drive options to set properties. This did seem to creep in between the upgrade from 8.0.4/default kernel to 8.1/2.6.27-11 because at 8.0.4 usb mass storage was being recognised by the kernel.

Thanks for the suggestions - I'm open to any others!