USB hard drive no longer mounting

[cliverlong]

(15th Jul, 2014 01:40 AM)IriDium Wrote:  I would check your hard disk on another machine (Windows chkdsk) and see if it reports any errors. It's difficult to deduce what was mounted at the time, but if you have a look in dmesg @ 970 you will see I/O errors. This could be the reason it is not mounting.

If all looks fine, plug in the POWERED USB hub with the HDD, boot the RPi and when loaded, repost the dmesg output, along with "df -h" and "mount"

Hello,

As you suggested (thanks) I ran chkdsk on Windows (no errors - see attached log). Windows sometimes says there is a problem with the disk but goes ahead and mounts it and files seem fine. Maybe some flag (somewhere) is not being reset when the disk is disconnected from the laptop ??

I then did the power cycle on the rpi with the usb disk attached at rpi start up.

A key comment in the attached log seems to be

[ 4.270798] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck

I tried to run fsck but maybe that isn't possible if the disk isn't mounted - limit of my knowledge.

Results from commands are in following text file:

https://dl.dropboxusercontent.com/u/32576758/2014-07-14-xbian-usb-disk-attached-at-boot.txt


I could reformat the disk and try again ?? Is it possible there is a problem mounting a 250Gbytes FAT32 disk since a 2GB SD card in a USB attached card reader mounts on the rpi without problems? I have used the 2GB "external" SD card to copy a video file to the rpi and that works fine and the copied video plays with no errors - so the USB hub connection to the rpi is all ok.

Thanks,