Ubuntu 13.04 non legge hard disk esterno

Salve a tutti,
io avevo Windows 7 su un Packard Bell, su cui ho installato Ubuntu perché avevo un Hard Disk esterno che Windows mi chiedeva di formattare. Allora mi consigliarono una distribuzione Linux.

Sono molto contento di averlo installato perché con Windows il PC andava lento, ma ora è un fulmine con Ubuntu, ma comunque l'hard disk esterno non me lo legge proprio, il computer non me lo rileva, ma nel terminale sì. Comunque ho letto una guida e scrivendo lsusb esce scritto :

$ lsusb
Bus 001 Device 006: ID 0bc2:2300 Seagate RSS LLC Expansion Portable
Bus 003 Device 002: ID 0826:0501 Data Transit 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Scrivendo sudo fdisk -l

$ sudo fdisk -l 
[sudo] password for melillo:

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 testine, 63 settori/tracce, 9729 cilindri, totale 156301488 settori
Unità = settori di 1 * 512 = 512 byte
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Identificativo disco: 0xb16a4bc8

Dispositivo Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      206847      102400    7  HPFS/NTFS/exFAT
/dev/sda2          206848   100362463    50077808    7  HPFS/NTFS/exFAT
/dev/sda3       100364286   156301311    27968513    5  Esteso
/dev/sda5       100364288   155387903    27511808   83  Linux
/dev/sda6       155389952   156301311      455680   82  Linux swap / Solaris

Disk /dev/sdb: 320.1 GB, 320072933376 bytes
1 testine, 63 settori/tracce, 9922896 cilindri, totale 625142448 settori
Unità = settori di 1 * 512 = 512 byte
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Identificativo disco: 0x00f2db34

Dispositivo Boot      Start         End      Blocks   Id  System
/dev/sdb1   *          63   625137407   312568672+   7  HPFS/NTFS/exFAT

Scrivendo infine sudo mount disk /dev/sdb1 /mnt esce

$ sudo mount disk /dev/sdb1 /mnt 
Usage: mount -V                 : print version
       mount -h                 : print this help
       mount                    : list mounted filesystems
       mount -l                 : idem, including volume labels
So far the informational part. Next the mounting.
The command is `mount [-t fstype] something somewhere'.
Details found in /etc/fstab may be omitted.
       mount -a [-t|-O] ...     : mount all stuff from /etc/fstab
       mount device             : mount device at the known place
       mount directory          : mount known device here
       mount -t type dev dir    : ordinary mount command
Note that one does not really mount a device, one mounts
a filesystem (of the given type) found on the device.
One can also mount an already visible directory tree elsewhere:
       mount --bind olddir newdir
or move a subtree:
       mount --move olddir newdir
One can change the type of mount containing the directory dir:
       mount --make-shared dir
       mount --make-slave dir
       mount --make-private dir
       mount --make-unbindable dir
One can change the type of all the mounts in a mount subtree
containing the directory dir:
       mount --make-rshared dir
       mount --make-rslave dir
       mount --make-rprivate dir
       mount --make-runbindable dir
A device can be given by name, say /dev/hda1 or /dev/cdrom,
or by label, using  -L label  or by uuid, using  -U uuid .
Other options: [-nfFrsvw] [-o options] [-p passwdfd].
For many more details, say  man 8 mount .

e io a questo punto non so cosa devo fare.

Vi prego aiutatemi!