[kwlug-disc] Media errors on a USB disk

[William Park]

If you take the disk to another computer and get errors, then it's the disk or 
USB circuit (on enclosure side).  If not, then it's USB circuit (in computer) or 
USB driver.  My guess...

  
>
>From: Khalid Baheyeldin <kb at 2bits.com>
>To: KWLUG discussion <kwlug-disc at kwlug.org>
>Sent: Wed, October 20, 2010 10:08:27 AM
>Subject: [kwlug-disc] Media errors on a USB disk
>
>For the weekly backup, I am now getting this error:
>
>[2388063.441067] sd 13:0:0:0: [sdb] Result: hostbyte=DID_OK 
>driverbyte=DRIVER_SENSE,SUGGEST_OK
>[2388063.441073] sd 13:0:0:0: [sdb] Sense Key : Medium Error [current] 
>[2388063.441077] sd 13:0:0:0: [sdb] Add. Sense: Unrecovered read error
>[2388063.441080] end_request: I/O error, dev sdb, sector 177045897
>[2388064.495756] sd 13:0:0:0: [sdb] Result: hostbyte=DID_OK 
>driverbyte=DRIVER_SENSE,SUGGEST_OK
>[2388064.495762] sd 13:0:0:0: [sdb] Sense Key : Medium Error [current] 
>[2388064.495765] sd 13:0:0:0: [sdb] Add. Sense: Unrecovered read error
>[2388064.495768] end_request: I/O error, dev sdb, sector 177045897
>
>If I replace the disk with an identical brand (but has a different make
>of disk inside), I get other errors.
>
>These two disks have been stable and trouble free for about 2 years,
>with no issues.
>
>My questions are:
>
>1. Short of dd if=/dev/sdb, is there a way to detect blocks?
>
>2. Do we have a way to add the bad blocks to a list that the operating system
>should ignore, like we had in the old days?
>
>3. Could this be a quirk of some sort? How do I know for sure if it is 
>really a media problem or some bug/quirk?
>
>Thanks in advance.
>-- 
>Khalid M. Baheyeldin
>2bits.com, Inc.
>http://2bits.com
>Drupal optimization, development, customization and consulting.
>Simplicity is prerequisite for reliability. --  Edsger W.Dijkstra
>Simplicity is the ultimate sophistication. --   Leonardo da Vinci
>

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