Now everything works fine with Ubuntu 12.04 and my computer.
I fix the problem updating the motherboard bios.
So the problem was an hardware problem and not an Ubuntu problem for me.
I have a motherboard with USB 3.

2012/10/21 avinash <email address hidden>

> I am facing the same issue on 3.2.0-32-generic-pae #51-Ubuntu 12.04 LTS,
> for my iomega320GB external usb drive.
> Please let me know if their is a fi x avaialable or should i tweak
> something.thnaks in advance.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/349767
>
> Title:
>   external USB hard drive disconnects
>
> Status in The Linux Kernel:
>   Fix Released
> Status in “linux” package in Ubuntu:
>   Won't Fix
> Status in “linux” source package in Lucid:
>   Confirmed
>
> Bug description:
>   This is a new external drive enclosure.
>
>   I can easily reproduce this:
>
>   Plug in the usb cable and power up the drive. System log shows:
>
>   Mar 27 11:05:07 XPS-1 kernel: [ 7259.584108] usb 2-2: new high speed USB
> device using ehci_hcd and address 7
>   Mar 27 11:05:07 XPS-1 kernel: [ 7259.720027] usb 2-2: configuration #1
> chosen from 1 choice
>   Mar 27 11:05:07 XPS-1 kernel: [ 7259.757608] Initializing USB Mass
> Storage driver...
>   Mar 27 11:05:07 XPS-1 kernel: [ 7259.762530] scsi5 : SCSI emulation for
> USB Mass Storage devices
>   Mar 27 11:05:07 XPS-1 kernel: [ 7259.768158] usbcore: registered new
> interface driver usb-storage
>   Mar 27 11:05:07 XPS-1 kernel: [ 7259.768167] USB Mass Storage support
> registered.
>   Mar 27 11:05:12 XPS-1 kernel: [ 7264.769258] scsi 5:0:0:0: Direct-Access
>     WDC WD16 00JB-75GVA0      08.0 PQ: 0 ANSI: 0
>   Mar 27 11:05:12 XPS-1 kernel: [ 7264.773347] sd 5:0:0:0: [sdb] 312499999
> 512-byte hardware sectors: (159 GB/149 GiB)
>   Mar 27 11:05:12 XPS-1 kernel: [ 7264.793936] sd 5:0:0:0: [sdb] Write
> Protect is off
>   Mar 27 11:05:12 XPS-1 kernel: [ 7264.801920] sd 5:0:0:0: [sdb] 312499999
> 512-byte hardware sectors: (159 GB/149 GiB)
>   Mar 27 11:05:12 XPS-1 kernel: [ 7264.804738] sd 5:0:0:0: [sdb] Write
> Protect is off
>   Mar 27 11:05:12 XPS-1 kernel: [ 7264.804760]  sdb: sdb1
>   Mar 27 11:05:12 XPS-1 kernel: [ 7264.837230] sd 5:0:0:0: [sdb] Attached
> SCSI disk
>   Mar 27 11:05:12 XPS-1 kernel: [ 7264.837377] sd 5:0:0:0: Attached scsi
> generic sg2 type 0
>   Mar 27 11:05:13 XPS-1 kernel: [ 7265.513967] kjournald starting.  Commit
> interval 5 seconds
>   Mar 27 11:05:13 XPS-1 kernel: [ 7265.513995] EXT3-fs warning: maximal
> mount count reached, running e2fsck is recommended
>   Mar 27 11:05:13 XPS-1 kernel: [ 7265.515031] EXT3 FS on sdb1, internal
> journal
>   Mar 27 11:05:13 XPS-1 kernel: [ 7265.515040] EXT3-fs: recovery complete.
>   Mar 27 11:05:13 XPS-1 kernel: [ 7265.522316] EXT3-fs: mounted filesystem
> with ordered data mode.
>
>   Now if I do anything that causes reads from the drive (in this case
>   "du -sh /media/disk", I get the following in the log:
>
>   Mar 27 11:05:48 XPS-1 kernel: [ 7300.911188] usb 2-2: reset high speed
> USB device using ehci_hcd and address 7
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.173948] sd 5:0:0:0: [sdb] Result:
> hostbyte=DID_ERROR driverbyte=DRIVER_OK,SUGGEST_OK
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.174001] usb 2-2: USB disconnect,
> address 7
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.174266] sd 5:0:0:0: [sdb] Result:
> hostbyte=DID_ERROR driverbyte=DRIVER_OK,SUGGEST_OK
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.174448] sd 5:0:0:0: [sdb] Result:
> hostbyte=DID_ERROR driverbyte=DRIVER_OK,SUGGEST_OK
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.174617] sd 5:0:0:0: [sdb] Result:
> hostbyte=DID_ERROR driverbyte=DRIVER_OK,SUGGEST_OK
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.174776] sd 5:0:0:0: [sdb] Result:
> hostbyte=DID_ERROR driverbyte=DRIVER_OK,SUGGEST_OK
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.174956] lost page write due to I/O
> error on sdb1
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175588] ------------[ cut here
> ]------------
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175594] WARNING: at
> /build/buildd/linux-2.6.28/fs/buffer.c:1186 mark_buffer_dirty+0x7d/0xa0()
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175599] Modules linked in:
> usb_storage aes_i586 aes_generic xt_limit xt_tcpudp ipt_LOG ipt_MASQUERADE
> xt_DSCP ipt_REJECT nf_conntrack_irc nf_conntrack_ftp xt_state i915 drm
> binfmt_misc ppdev bnep bridge stp kvm_intel kvm kqemu input_polldev joydev
> sbp2 lp parport iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack
> nf_defrag_ipv4 iptable_mangle iptable_filter ip_tables x_tables
> snd_hda_intel arc4 ecb snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy
> snd_seq_oss iwlagn iwlcore snd_seq_midi snd_rawmidi snd_seq_midi_event
> uvcvideo snd_seq snd_timer snd_seq_device led_class compat_ioctl32 videodev
> hid_dell snd psmouse mac80211 soundcore intel_agp usbhid serio_raw agpgart
> snd_page_alloc v4l1_compat video cfg80211 sdhci_pci sdhci iTCO_wdt
> iTCO_vendor_support output dcdbas ohci1394 ieee1394 tg3 fbcon tileblit font
> bitblit softcursor [last unloaded: pcspkr]
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175756] Pid: 14093, comm: du Not
> tainted 2.6.28-11-generic #37-Ubuntu
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175761] Call Trace:
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175771]  [<c0500ae1>] ?
> printk+0x18/0x1f
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175779]  [<c0139ad4>]
> warn_on_slowpath+0x54/0x80
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175788]  [<c033d600>] ?
> vt_console_print+0x1f0/0x320
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175797]  [<c0502b68>] ?
> __lock_text_start+0x8/0x20
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175804]  [<c033d640>] ?
> vt_console_print+0x230/0x320
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175812]  [<c02cbbbb>] ?
> string+0x2b/0xe0
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175819]  [<c033d410>] ?
> vt_console_print+0x0/0x320
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175827]  [<c013a2a9>] ?
> release_console_sem+0x1c9/0x200
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175836]  [<c01dd9fd>]
> mark_buffer_dirty+0x7d/0xa0
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175844]  [<c0219e36>]
> ext3_commit_super+0x46/0x70
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175852]  [<c021c138>]
> ext3_handle_error+0x48/0xb0
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175858]  [<c0500ae1>] ?
> printk+0x18/0x1f
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175865]  [<c021c261>]
> ext3_error+0x51/0x60
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175872]  [<c0212f06>]
> __ext3_get_inode_loc+0x296/0x300
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175881]  [<c01cfea7>] ?
> get_new_inode_fast+0xe7/0x120
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175888]  [<c01d0ae3>] ?
> iget_locked+0x53/0x60
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175894]  [<c0212fc5>]
> ext3_iget+0x55/0x3d0
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175903]  [<c01ccb15>] ?
> d_rehash+0x45/0x60
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175909]  [<c02187e1>]
> ext3_lookup+0x81/0xd0
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175916]  [<c0502d08>] ?
> _spin_lock+0x8/0x10
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175923]  [<c01ce767>] ?
> d_alloc+0x137/0x190
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175931]  [<c01c6ac7>]
> real_lookup+0xa7/0x110
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175938]  [<c01c6bb5>]
> do_lookup+0x85/0xc0
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175945]  [<c01c7125>]
> __link_path_walk+0x535/0xb30
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175953]  [<c01c7b74>]
> path_walk+0x54/0xb0
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175961]  [<c01c7d0e>]
> do_path_lookup+0xae/0x190
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175968]  [<c01c894a>]
> user_path_at+0x4a/0x80
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175975]  [<c01c10ae>]
> vfs_lstat_fd+0x1e/0x50
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175982]  [<c01c1228>]
> sys_fstatat64+0x48/0x60
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175990]  [<c0103f6b>]
> sysenter_do_call+0x12/0x2f
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.175999]  [<c0500000>] ?
> relay_hotcpu_callback+0x4d/0xbd
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.176034] ---[ end trace
> 9ff3116a5fd25f1f ]---
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.177450] lost page write due to I/O
> error on sdb1
>   Mar 27 11:05:49 XPS-1 kernel: [ 7301.177527] lost page write due to I/O
> error on sdb1
>
>   I have not gotten the stack trace every time this happens, so that may
>   be incidental to the fundamental problem.
>
>   ProblemType: Bug
>   Architecture: i386
>   DistroRelease: Ubuntu 9.04
>   MachineType: Dell Inc. XPS M1330
>   Package: linux-image-2.6.28-11-generic 2.6.28-11.37
>   ProcCmdLine: root=UUID=52bfcdb8-5615-4225-b411-3cc63da13a24 ro quiet
> splash  crashkernel=384M-2G:64M@16M,2G-:128M@16M
>   ProcEnviron:
>    PATH=(custom, user)
>    LANG=en_US.UTF-8
>    SHELL=/bin/bash
>   ProcVersionSignature: Ubuntu 2.6.28-11.37-generic
>   SourcePackage: linux
>
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>