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92 posts

Master Geek

#86435 6-Jul-2011 20:54
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Hi guys, 

I have Ubuntu 11.04 and i'm having trouble with my USB and External not mounting automatically. I'm a bit of a Linux noob so bear with me. 

When i plug in my USB i see it in Disk Utility but it doesn't mount.

I followed this guide.

My auto mount settings are fine but it doesn't mount. I get this error

Error mounting: mount exited with exit code 1: helper failed with:
mount: according to mtab, /dev/sda1 is already mounted on /
mount failed
 I normally mount manually which is annoying.

I assume that it is trying to mount my USB where my internal hard drive is already mounted.

Any help would be much appreciated.


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859 posts

Ultimate Geek

  #490378 7-Jul-2011 00:55
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Error mounting: mount exited with exit code 1: helper failed with:
mount: according to mtab, /dev/sda1 is already mounted on /
mount failed

This suggests that your USB disk was detected as /dev/sda and it tries to mount /dev/sda1 which fails because it thinks that /dev/sda1 is already mounted.

Remember in linux, /dev/sda is the whole drive,
The device /dev/sda1 is the first partition on that drive.

In most cases, the first SATA disk will be detected by linux as /dev/sda
Then the second disk (which might be USB) will be /dev/sdb

However if the first hard disk is detected as something else - /dev/hda used to be common.
Then the next SCSI/SATA/USB dive that you plug in is most likely going to become device /dev/sda

Can you show us the output of the df command (without the USB drive plugged in).
Plus # cat /etc/mtab

The other useful thing can be to monitor /var/log/messages
# tail -f /var/log/messages

Then plug in your USB drive - what do you see?

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