Differences between boot sector and its backup

[Jonno.Johnson.UK]

Whilst booting Raspbian I noticed an error so I checked /var/log/syslog and found

Oct 30 01:22:11 raspberrypi kernel: [ 11.899027] EXT4-fs (mmcblk0p6): re-mounted. Opts: (null)
Oct 30 01:22:11 raspberrypi kernel: [ 12.491103] EXT4-fs (mmcblk0p6): re-mounted. Opts: (null)
Oct 30 01:22:11 raspberrypi kernel: [ 19.176409] FAT-fs (mmcblk0p5): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.

I figured out that I needed to execute
sudo fsck -p /dev/mmcblk0p5 and it returned

fsck from util-linux 2.20.1
dosfsck 3.0.13, 30 Jun 2012, FAT32, LFN
There are differences between boot sector and its backup.
Differences: (offset:original/backup)
65:01/00
Not automatically fixing this.
/dev/mmcblk0p5: 15 files, 19616/120958 clusters


Advice please - Do I need to fix this manually? If so, how?

[Jonno.Johnson.UK]

Well, it appears that I was wrong.

I unmounted the device and ran fsck then did a shutdown thinking it would clear the error, but I am still seeing it on boot up.

Advice please.

I know enough to do harm, but not enough to do good, it would seem!

[knute]

I have the same problem, I caused it by unplugging my jump drive while the computer was running. I got the same errors and did the same fix, which cleared up the error when I run fsck but not when I boot.

If you find a solution for this I would love to know. I'm also really curious how the boot sector and its backup are configured.

[DougieLawson]

http://www.raspberrypi.org/forums/viewt ... 28&t=64843

[Jonno.Johnson.UK]

Thanks for the pointer Dougie.

That worked for me.

knute...
sudo umount /boot
sudo git clone http://daniel-baumann.ch/git/software/dosfstools.git
cd dosfstools
sudo make
sudo make install
sudo ./fsck.fat -V /dev/mmcblk0p1 ...p5 in my case and I told it to remove the dirty bit
sudo ./fsck.fat -a /dev/mmcblk0p1 ...p5 again
sudo mount /boot

I then did a sudo reboot and the error was gone.

[Joe Schmoe]

I then did a sudo reboot and the error was gone.

Don't you mean that it was sudo gone?

(Hint: Most of those sudo's are unnecessary - and potentially dangerous)

[knute]

http://www.raspberrypi.org/forums/viewt ... 28&t=64843

Hey thanks. I tried both your suggestion and the other fellow's about using the jessie repo. Both work just fine but adding the additional repo makes apt-get update take twice as long, so I took it out.

[rpdom]

(Hint: Most of those sudo's are unnecessary - and potentially dangerous)

Well, two of them at least. make doesn't need sudo, nor does git (unless you're running in a directory where you shouldn't be). The rest probably do need sudo in this case.

[Jonno.Johnson.UK]

(Hint: Most of those sudo's are unnecessary - and potentially dangerous)

Well, two of them at least. make doesn't need sudo, nor does git (unless you're running in a directory where you shouldn't be). The rest probably do need sudo in this case.

I only know enough to be dangerous

I don't know enough to know when I sudo need one or not