The issue is an Eisenbug ( http://en.wikipedia.org/wiki/Heisenbug ). In this moment my disk has been mounted perfectly and automatically (both partitions). The messages are: 

SYS: Oct 23 15:02:22 samsung-romano kernel: [10752.645573] usb 3-1: new high-speed USB device number 2 using xhci_hcd
SYS: Oct 23 15:02:22 samsung-romano kernel: [10752.666699] usb 3-1: New USB device found, idVendor=059b, idProduct=0470
SYS: Oct 23 15:02:22 samsung-romano kernel: [10752.666708] usb 3-1: New USB device strings: Mfr=10, Product=11, SerialNumber=5
SYS: Oct 23 15:02:22 samsung-romano kernel: [10752.666714] usb 3-1: Product: Storage
SYS: Oct 23 15:02:22 samsung-romano kernel: [10752.666719] usb 3-1: Manufacturer: Iomega
SYS: Oct 23 15:02:22 samsung-romano kernel: [10752.666723] usb 3-1: SerialNumber: 6E34633FFFFF
SYS: Oct 23 15:02:22 samsung-romano mtp-probe: checking bus 3, device 2: "/sys/devices/pci0000:00/0000:00:1c.4/0000:04:00.0/usb3/3-1"
SYS: Oct 23 15:02:22 samsung-romano mtp-probe: bus: 3, device: 2 was not an MTP device
SYS: Oct 23 15:02:22 samsung-romano kernel: [10752.745152] Initializing USB Mass Storage driver...
SYS: Oct 23 15:02:22 samsung-romano kernel: [10752.745565] scsi6 : usb-storage 3-1:1.0
SYS: Oct 23 15:02:22 samsung-romano kernel: [10752.745780] usbcore: registered new interface driver usb-storage
SYS: Oct 23 15:02:22 samsung-romano kernel: [10752.745787] USB Mass Storage support registered.
SYS: Oct 23 15:02:23 samsung-romano kernel: [10753.787137] scsi 6:0:0:0: Direct-Access     ST950032 5AS                   PQ: 0 ANSI: 2 CCS
SYS: Oct 23 15:02:23 samsung-romano kernel: [10753.788991] sd 6:0:0:0: Attached scsi generic sg3 type 0
SYS: Oct 23 15:02:23 samsung-romano kernel: [10753.789931] sd 6:0:0:0: [sdc] 976773168 512-byte logical blocks: (500 GB/465 GiB)
SYS: Oct 23 15:02:23 samsung-romano kernel: [10753.791825] sd 6:0:0:0: [sdc] Write Protect is off
SYS: Oct 23 15:02:23 samsung-romano kernel: [10753.791837] sd 6:0:0:0: [sdc] Mode Sense: 28 00 00 00
SYS: Oct 23 15:02:23 samsung-romano kernel: [10753.792962] sd 6:0:0:0: [sdc] No Caching mode page present
SYS: Oct 23 15:02:23 samsung-romano kernel: [10753.792975] sd 6:0:0:0: [sdc] Assuming drive cache: write through
SYS: Oct 23 15:02:23 samsung-romano kernel: [10753.795535] sd 6:0:0:0: [sdc] No Caching mode page present
SYS: Oct 23 15:02:23 samsung-romano kernel: [10753.795544] sd 6:0:0:0: [sdc] Assuming drive cache: write through
SYS: Oct 23 15:02:23 samsung-romano kernel: [10753.862304]  sdc: sdc1 sdc2
SYS: Oct 23 15:02:23 samsung-romano kernel: [10753.865773] sd 6:0:0:0: [sdc] No Caching mode page present
SYS: Oct 23 15:02:23 samsung-romano kernel: [10753.865784] sd 6:0:0:0: [sdc] Assuming drive cache: write through
SYS: Oct 23 15:02:23 samsung-romano kernel: [10753.865792] sd 6:0:0:0: [sdc] Attached SCSI disk
SYS: Oct 23 15:02:24 samsung-romano dbus[703]: [system] Activating service name='org.freedesktop.hostname1' (using servicehelper)
SYS: Oct 23 15:02:24 samsung-romano dbus[703]: [system] Successfully activated service 'org.freedesktop.hostname1'
SYS: Oct 23 15:02:25 samsung-romano udisksd[2497]: Mounted /dev/sdc2 at /media/romano/movlin on behalf of uid 1153
SYS: Oct 23 15:02:25 samsung-romano kernel: [10754.957547] EXT4-fs (sdc2): mounted filesystem with ordered data mode. Opts: (null)
SYS: Oct 23 15:02:26 samsung-romano ntfs-3g[16391]: Version 2013.1.13AR.1 external FUSE 29
SYS: Oct 23 15:02:26 samsung-romano ntfs-3g[16391]: Mounted /dev/sdc1 (Read-Write, label "IOMEGA", NTFS 3.1)
SYS: Oct 23 15:02:26 samsung-romano ntfs-3g[16391]: Cmdline options: rw,nosuid,nodev,uhelper=udisks2,uid=1153,gid=1001,dmask=0077,fmask=0177
SYS: Oct 23 15:02:26 samsung-romano ntfs-3g[16391]: Mount options: rw,nosuid,nodev,uhelper=udisks2,allow_other,nonempty,relatime,default_permissions,fsname=/dev/sdc1,blkdev,blksize=4096
SYS: Oct 23 15:02:26 samsung-romano ntfs-3g[16391]: Global ownership and permissions enforced, configuration type 7
SYS: Oct 23 15:02:26 samsung-romano udisksd[2497]: Mounted /dev/sdc1 at /media/romano/IOMEGA on behalf of uid 1153