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[jmp <jmp@xxxxxxxxxx>]

I use a Maxtor OneTouch 250GB, and can confirm the previous reports:
even an fsck that returns "clean" (ext3 partition inside) is followed by 2 errors like:

end_request: critical target error, dev sdX, sector 0

Any subsequent fsck turns off the journal and finds many previously non existent errors. 
All consistent with the diagnose and explanations given (see dmesg log below).

(Can't run smartmontools nor hdparm, "unsupported USB bridge").

Tried with all trusty linux-image updates since 3.13.0-35, even linux-image-generic-lts-utopic
(3.16.0.31.24) . All have this bug.

Reinstalled 3.13.0-34 just to be able to use this drive. It's really
unfortunate that kernel maintainers refuse to fix this; seems my Ubuntus
are stuck with this version 3.13.0-34  then.

Relevant dmesg:

[  935.744030] usb 1-2: new high-speed USB device number 3 using ehci-pci
[  935.876881] usb 1-2: New USB device found, idVendor=0d49, idProduct=7010
[  935.876885] usb 1-2: New USB device strings: Mfr=1, Product=3, SerialNumber=2
[  935.876888] usb 1-2: Product: OneTouch
[  935.876890] usb 1-2: Manufacturer: Maxtor
[  935.876893] usb 1-2: SerialNumber: Y61JF0XE    
[  935.943600] usbcore: registered new interface driver usb-storage
[  935.958880] usbcore: registered new interface driver uas
[  935.960525] ums-onetouch 1-2:1.0: USB Mass Storage device detected
[  935.960754] input: Maxtor OneTouch as /devices/pci0000:00/0000:00:1a.7/usb1/1-2/input/input11
[  935.961336] scsi6 : usb-storage 1-2:1.0
[  935.961819] usbcore: registered new interface driver ums-onetouch
[  937.166087] scsi 6:0:0:0: Direct-Access     Maxtor   OneTouch         0200 PQ: 0 ANSI: 0 CCS
[  937.168548] sd 6:0:0:0: Attached scsi generic sg3 type 0
[  937.169183] sd 6:0:0:0: [sdc] 490232832 512-byte logical blocks: (250 GB/233 GiB)
[  937.375463] sd 6:0:0:0: [sdc] Write Protect is off
[  937.375468] sd 6:0:0:0: [sdc] Mode Sense: 1c 00 00 00
[  937.581825] sd 6:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[  938.025841]  sdc: sdc1
[  938.469132] sd 6:0:0:0: [sdc] Attached SCSI disk
[ 1060.257726] end_request: critical target error, dev sdc, sector 0
[ 1060.260096] end_request: critical target error, dev sdc, sector 0
[ 1091.387256] usb 1-2: USB disconnect, device number 3
[ 1091.387810] sd 6:0:0:0: [sdc] Synchronizing SCSI cache
[ 1091.387842] sd 6:0:0:0: [sdc]  
[ 1091.387845] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK

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https://bugs.launchpad.net/bugs/1366538

Title:
  Synchronisation/close /dev/sdX: i/o error on target host

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Trusty:
  Triaged
Status in linux source package in Utopic:
  Triaged
Status in linux source package in Vivid:
  Triaged

Bug description:
  Ubuntu 14.04.1 x86-64
  wanting to unmout a pata drive (usb attached), I get this (title) "Warning from libparted" when gparted launches.
  Same issue with another pc x86-64
  Errors retries then ignore, shred /dev/sdi fails:

  shred: /dev/sdi : pass 1/2 (random)…
  shred: /dev/sdi : pass 1/2 (random)…231MiB/94GiB 0 %
  shred: /dev/sdi : failure of fdatasync: i/o error on target host

  I reached to shred the drive from a 12.04.4 i386 pc with no error.

  Sep  7 15:07:08 nux kernel: [261448.072475] usb 5-1: new high-speed USB device number 10 using xhci_hcd
  Sep  7 15:07:09 nux kernel: [261448.202999] usb 5-1: New USB device found, idVendor=04cf, idProduct=8818
  Sep  7 15:07:09 nux kernel: [261448.203008] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
  Sep  7 15:07:09 nux kernel: [261448.203013] usb 5-1: Product: USB Mass Storage Device
  Sep  7 15:07:09 nux kernel: [261448.203018] usb 5-1: Manufacturer: Myson Century, Inc.
  Sep  7 15:07:09 nux kernel: [261448.205463] usb-storage 5-1:1.0: USB Mass Storage device detected
  Sep  7 15:07:09 nux kernel: [261448.205673] scsi20 : usb-storage 5-1:1.0
  Sep  7 15:07:10 nux kernel: [261449.206849] scsi 20:0:0:0: Direct-Access     HTS72101 0G9AT00          MCZO PQ: 0 ANSI: 0 CCS
  Sep  7 15:07:10 nux kernel: [261449.207763] sd 20:0:0:0: Attached scsi generic sg7 type 0
  Sep  7 15:07:10 nux kernel: [261449.207901] sd 20:0:0:0: [sdi] 195371568 512-byte logical blocks: (100 GB/93.1 GiB)
  Sep  7 15:07:10 nux kernel: [261449.208068] sd 20:0:0:0: [sdi] Write Protect is off
  Sep  7 15:07:10 nux kernel: [261449.208074] sd 20:0:0:0: [sdi] Mode Sense: 00 14 00 00
  Sep  7 15:07:10 nux kernel: [261449.208280] sd 20:0:0:0: [sdi] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
  Sep  7 15:07:10 nux kernel: [261449.555232]  sdi: unknown partition table
  Sep  7 15:07:10 nux kernel: [261449.555926] sd 20:0:0:0: [sdi] Attached SCSI disk
  Sep  7 15:07:43 nux kernel: [261482.219026] end_request: critical target error, dev sdi, sector 0
  Sep  7 15:07:52 nux kernel: [261492.015180] end_request: critical target error, dev sdi, sector 0
  Sep  7 15:07:55 nux kernel: [261494.261159] end_request: critical target error, dev sdi, sector 0
  Sep  7 15:16:23 nux kernel: [262003.027005] end_request: critical target error, dev sdi, sector 0
  Sep  7 15:16:35 nux kernel: [262014.215352] end_request: critical target error, dev sdi, sector 0
  Sep  7 15:16:35 nux kernel: [262014.859651] end_request: critical target error, dev sdi, sector 0

  [EDIT:
  Once shreded, no error on the i386, but still same error on the 2 x86-64]

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