I can't access my device partitions?

Question

I can't access my files in other partitions even if I mounted them by mount /dev/sda12?

How can I solve this problem? on Using cat /etc/fstab /etc/mtab I got the following output.

 /etc/fstab: static file system information.    
 Use 'blkid -o value -s UUID' to print the universally unique identifier
 for a device; this may be used with UUID= as a more robust way to name
 devices that works even if disks are added and removed. See fstab(5).  

 file system mount point   type  options       dump  pass  
proc            /proc           proc    nodev,noexec,nosuid 0       0  
/dev/sdb5       /               ext4    errors=remount-ro 0       1  
 swap was on /dev/sdb11 during installation  
UUID=c0f5af91-01c4-4a4a-8700-b03afbe2898a none            swap    sw              0       0    
/dev/sda5 / ext4 rw,errors=remount-ro 0 0  
proc /proc proc rw,noexec,nosuid,nodev 0 0  
none /sys sysfs rw,noexec,nosuid,nodev 0 0  
none /sys/fs/fuse/connections fusectl rw 0 0  
none /sys/kernel/debug debugfs rw 0 0  
none /sys/kernel/security securityfs rw 0 0  
none /dev devtmpfs rw,mode=0755 0 0  
none /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0  
none /dev/shm tmpfs rw,nosuid,nodev 0 0  
none /var/run tmpfs rw,nosuid,mode=0755 0 0  
none /var/lock tmpfs rw,noexec,nosuid,nodev 0 0  
none /lib/init/rw tmpfs rw,nosuid,mode=0755 0 0

And for fdisk -l i got the following output:

Disk  /dev/sda: 320.1 GB, 320072933376 bytes  
84 heads, 59 sectors/track, 126138 cylinders, total 625142448 sectors  
Units = sectors of 1 * 512 = 512 bytes  
Sector size (logical/physical): 512 bytes / 512 bytes  
I/O size (minimum/optimal): 512 bytes / 512 bytes  
Disk identifier: 0x005c005c  

   Device Boot      Start         End      Blocks   Id  System  
/dev/sda1   *          59    52097471    26048706+   7  HPFS/NTFS/exFAT  
/dev/sda2        52099127   625134971   286517922+   f  W95 Ext'd (LBA)  
/dev/sda5        52099129    81399910    14650391   83  Linux  
/dev/sda6       104195003   208384931    52094964+   7  HPFS/NTFS/exFAT  
/dev/sda7       208384991   312574919    52094964+   7  HPFS/NTFS/exFAT  
/dev/sda8       312574979   416764907    52094964+   7  HPFS/NTFS/exFAT  
/dev/sda9       416764967   520954895    52094964+   7  HPFS/NTFS/exFAT  
/dev/sda10      520954955   625134971    52090008+   7  HPFS/NTFS/exFAT  
/dev/sda11       81401856    84664319     1631232   82  Linux swap / Solaris  
/dev/sda12       84666368   104194047     9763840   83  Linux  

Partition table entries are not in disk order

Answer 1

As drake01 has said, if you use the -t flag, you need to specify the filesystem type after it. See man mount for details.

However, you usually do not need to specify -t or the filesystem type. mount should be able to infer the filesystem type, and when it cannot, usually that means you are mounting it incorrectly or there's something wrong with the partition.

Furthermore, you generally must run mount as root.

So you could just use:

sudo mount /dev/sda12

But that, too, will be insufficient unless /dev/sda12 is listed in /etc/fstab. Otherwise, you must mount it, specifying the mount point.

So, if you wanted a mount point of /media/Foo, first you would have to create it (if it's not already there):

sudo mkdir /media/Foo

Then you'd mount the drive there, specifying that as the mount point:

sudo mount /dev/sda12 /media/Foo

You can see what's mounted by running mount with no arguments:

mount

Once mounted, you can unmount it with the umount command, passing the device node name or the mount point name:

sudo umount /dev/sda12

sudo umount /media/Foo

You may prefer to mount this volume without running any commands as root, and without having to create or specify a mount point. You can accomplish that with a dynamic mount. The mount point is created on-the-fly and is named the same as the volume name (unless there is no volume name, then usually it's the partition's UUID).

Dynamic mounting in Ubuntu is done with udisks. You can invoke it explicitly:

udisks --mount /dev/sda12

Or you can click on the volume in a file manager like Nautilus, and the appropriate udisks command will be invoked automatically. (This is especially helpful if you don't know the device name but could identify the partition's volume name in a list.)

To unmount a partition that is mounted with udisks:

udisks --unmount /dev/sda12

Or you can still unmount it directly as root, if you wish:

sudo umount /dev/sda12

Answer 2

-t flag in mount command expects the type of the filesystem after it. Assuming that the partition you are trying to mount is ntfs you should run sudo mkdir /media/mydrive123; mount -t ntfs /dev/sda12 /media/mydrive123 It should mount the sda12 on mydrive123 in /media directory. Now you should be able to access the contents of sda12.