Read Errors on USB Drive

[George Toft]

There is a special version of dd that will retry on bad sectors and try 
to formulate a best guess for the bad sector.  I've used it with some 
success - took about 2 weeks to recover a 300GB drive.  I also had to 
keep it refrigerated.

Regards,

George Toft

On 12/19/2015 9:32 AM, Stephen Partington wrote:
>
> There is an application called test disk that might be handy for data 
> recovery. But this looks like your drive is in bad shape.
>
> On Dec 19, 2015 9:25 AM, "Mark Phillips" <mark at phillipsmarketing.biz 
> <mailto:mark at phillipsmarketing.biz>> wrote:
>
>     I have a 2 TB WD USB drive that I formated with NTFS. I have a
>     rather extensive movie/TV library on it for my plex media server,
>     and I am getting read errors. I hope I haven't lost all of that
>     data! It has been attached to one of my Netgear wireless access
>     points, hence the need for NTFS.
>
>     fdisk -l gives for the drive
>     /dev/sdc1 2048  3906963455  1953480704    7 HPFS/NTFS/exFAT
>
>     I tried running smartctl on the device, (which is now plugged into
>     a usb 3.0 port on my laptop) and got this error after a few tests
>
>     SMART Self-test log structure revision number 1
>     Num  Test_Description    Status Remaining  LifeTime(hours) 
>     LBA_of_first_error
>     # 1  Short offline       Completed: read failure       90%    
>     10086         494859396
>     # 2  Extended offline    Completed: read failure       90%    
>     10073         494859396
>     # 3  Extended offline    Completed: read failure       90%    
>     10072         494859396
>     # 4  Short offline       Completed: read failure       90%    
>     10072         494859396
>
>     I noticed this in the attributes section of smartctl -
>     Vendor Specific SMART Attributes with Thresholds:
>     ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE     
>     UPDATED  WHEN_FAILED RAW_VALUE
>       1 Raw_Read_Error_Rate     0x002f   200   200 051    Pre-fail 
>     Always       -       122
>       3 Spin_Up_Time            0x0027   202   200 021    Pre-fail 
>     Always       -       4891
>       4 Start_Stop_Count        0x0032   100   100 000    Old_age  
>     Always       -       464
>       5 Reallocated_Sector_Ct   0x0033   200   200 140    Pre-fail 
>     Always       -       0
>       7 Seek_Error_Rate         0x002e   100   253 000    Old_age  
>     Always       -       0
>       9 Power_On_Hours          0x0032   087   087 000    Old_age  
>     Always       -       10086
>      10 Spin_Retry_Count        0x0032   100   100 000    Old_age  
>     Always       -       0
>      11 Calibration_Retry_Count 0x0032   100   253 000    Old_age  
>     Always       -       0
>      12 Power_Cycle_Count       0x0032   100   100 000    Old_age  
>     Always       -       40
>     192 Power-Off_Retract_Count 0x0032   200   200 000    Old_age  
>     Always       -       17
>     193 Load_Cycle_Count        0x0032   198   198 000    Old_age  
>     Always       -       6187
>     194 Temperature_Celsius     0x0022   121   102 000    Old_age  
>     Always       -       31
>     196 Reallocated_Event_Count 0x0032   200   200 000    Old_age  
>     Always       -       0
>     197 Current_Pending_Sector  0x0032   200   200 000    Old_age  
>     Always       -       31
>     198 Offline_Uncorrectable   0x0030   100   253 000    Old_age  
>     Offline      -       0
>     199 UDMA_CRC_Error_Count    0x0032   200   200 000    Old_age  
>     Always       -       0
>     200 Multi_Zone_Error_Rate   0x0008   100   253 000    Old_age  
>     Offline      -       0
>
>     Any thoughts on how I can fix this drive, or do I need to get a
>     new one? What is the best way to copy the contents of the drive
>     with these errors to a new drive?
>
>     Thanks!
>
>     Mark
>
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