Hey can someone help me? I'm sorry if this question was asked before but I'm trying to open a 640GB Volume from the Launcher and I get this error:

Error mounting /dev/sdb2 at /media/ubuntu/98C83D3AC83D1848: Command-line `mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000" "/dev/sdb2" "/media/ubuntu/98C83D3AC83D1848"' exited with non-zero exit status 12: Failed to read last sector (1250256894): Invalid argument
HINTS: Either the volume is a RAID/LDM but it wasn't setup yet,
   or it was not setup correctly (e.g. by not using mdadm --build ...),
   or a wrong device is tried to be mounted,
   or the partition table is corrupt (partition is smaller than NTFS),
   or the NTFS boot sector is corrupt (NTFS size is not valid).
Failed to mount '/dev/sdb2': Invalid argument
The device '/dev/sdb2' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?

I'm really new to this, today is my first day trying Ubuntu as the primary OS on my PC (secondary would be Windows 7) and I'd like to know how to access this drive if possible. It's not the drive with the Windows 7 OS.

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you may want to run a drive diagnostic tool. My favorite hard drive diagnostic tool is ViVARD you can find it on UBCD – Neil Oct 25 '15 at 23:50
    
The volume is corrupt: it claims that it is larger than the partition it is in. You will need to reformat it. – psusi Oct 26 '15 at 0:15
    
Reformatting it isnt an option, given that more than half of it is full. – trickpinky Oct 26 '15 at 6:00

EDIT:

Visit this link and you'll find the solution to your problems as it has already happened to others. You drive has an SFS Dynamic Partitioning Scheme which is proprietary and owned by Microsoft. Check the comment made by user "Oldfred" in the link, it will come in handy! Cheers!

ORIGINAL

I think that the partition may be corrupt given the message that it shows but don't give up just yet. Ubuntu is a great GNU/Linux operating system, it's a shame that you have this kind of trouble.

I had a similar problem, have you tried using ntfs-3g or ntfsfix? or mount with ntfs-3g options? Was the NTFS drive in hibernation? Did it suffer a power cut?

Part of the man page of ntfsfix reads as follows:

ntfsfix is a utility that fixes some common NTFS problems.
ntfsfix is NOT a Linux version of chkdsk. It only repairs some
fundamental NTFS inconsistencies, resets the NTFS journal file and
schedules an NTFS consistency check for the first boot into Windows.

You may run ntfsfix on an NTFS volume if you think it was damaged by
Windows or some other way and it cannot be mounted.

Try this:

ntfsfix /path/to/ntfsdevice

In your case it would be:

ntfsfix /dev/sda2

Where /dev/sda2 is the NTFS partition with the issue. ntfsfix has some useful options like:

ntfsfix -b /dev/sda2

The -b options does the following: Clear the list of bad sectors. This is useful after cloning an old disk with bad sectors to a new disk.

Or:

ntfsfix -d /dev/sda2

The -d option does the following:

Clear the volume dirty flag if the volume can be fixed and mounted.
If the option is not present or the volume cannot be  fixed the dirty
volume flag is set to request a volume checking at next mount.

Hope this helps. Don't hesitate to ask again. Cheers!

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Okay, well i tried the ntfsfix /dev/sda2 and i get 'ubuntu@ubuntu-Inspiron-560:~$ ntfsfix /dev/sda2 Refusing to operate on read-write mounted device /dev/sda2.' – trickpinky Oct 26 '15 at 6:03
    
Sorry, did you use elevated privileges,sudo ntfsfix /dev/sda2? – zehnner Oct 26 '15 at 6:25
    
i did try that aswell, it gave me the same thing. – trickpinky Oct 26 '15 at 6:50
    
can you give me the output of sudo fsck /dev/sda2, thanks – zehnner Oct 26 '15 at 7:02
    
ubuntu@ubuntu-Inspiron-560:~$ sudo fsck /dev/sda2 [sudo] password for ubuntu: fsck from util-linux 2.26.2 – trickpinky Oct 26 '15 at 7:11

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