Comment # 7 on bug 937363 from George Anchev

More fresh info:

It seems I am actually able to mount the C: partition from that disk from
Dolphin. What I did was simply click the Devices > "System" (the name of that
partition) and entered root password.

But trying the same with last partition on that disk (named "Storage") resulted
in the following message:

"An error occurred while accessing 'Storage', the system responded: The
requested operation has failed: Error mounting /dev/md126p3 at
/run/media/george/Storage: Command-line `mount -t "ntfs" -o
"uhelper=udisks2,nodev,nosuid,uid=1000,gid=100,dmask=0077,fmask=0177"
"/dev/md126p3" "/run/media/george/Storage"' exited with non-zero exit status
12: Failed to read last sector (767051775): 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/md126p3': Invalid argument The device '/dev/md126p3' 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? "

Hope that gives more feedback.