Richard McIntyre wrote:
I'm having a similar problem,
Oct 13 03:01:31 tco1 kernel: ad2: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=181778119 Oct 13 07:11:15 tco1 kernel: ad2: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=181778119


I'm assuming that particular sector on the drive is dying, I have backed everything up on the drive, can anyone give me more information, should the drive simply be replaced or is it possible that this is simply a TOC error and could be corrected by newfs to the drive?

I'm guessing it will need to be replaced, output of smartctl is below....

Thanks
~Richard

Error 7742 occurred at disk power-on lifetime: 16036 hours (668 days + 4 hours) When the command that caused the error occurred, the device was active or idle.

 After command completion occurred, registers were:
 ER ST SC SN CL CH DH
 -- -- -- -- -- -- --
40 51 04 c7 b6 d5 ea Error: UNC 4 sectors at LBA = 0x0ad5b6c7 = 181778119

 Commands leading to the command that caused the error were:
 CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
 -- -- -- -- -- -- -- --  ----------------  --------------------
 c8 00 04 c7 b6 d5 ea 00      15:22:37.737  READ DMA
 c8 00 04 9b b4 e1 ea 00      15:22:37.493  READ DMA
 c8 00 04 97 b4 e1 ea 00      15:22:37.251  READ DMA
 c8 00 04 a7 b4 e1 ea 00      15:22:37.002  READ DMA
 c8 00 04 a3 b4 e1 ea 00      15:22:36.761  READ DMA

Error 7741 occurred at disk power-on lifetime: 16032 hours (668 days + 0 hours) When the command that caused the error occurred, the device was active or idle.

 After command completion occurred, registers were:
 ER ST SC SN CL CH DH
 -- -- -- -- -- -- --
40 51 04 c7 b6 d5 ea Error: UNC 4 sectors at LBA = 0x0ad5b6c7 = 181778119

 Commands leading to the command that caused the error were:
 CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
 -- -- -- -- -- -- -- --  ----------------  --------------------
 c8 00 04 c7 b6 d5 ea 00      11:08:40.154  READ DMA
 35 00 20 df ff 2b 40 00      11:08:40.145  WRITE DMA EXT
 35 00 20 1f d5 16 40 00      11:08:44.953  WRITE DMA EXT
 ca 00 20 3f c0 92 ef 00      11:08:40.258  WRITE DMA
 ca 00 20 df 85 81 ef 00      11:08:40.250  WRITE DMA

Error 7740 occurred at disk power-on lifetime: 16012 hours (667 days + 4 hours) When the command that caused the error occurred, the device was active or idle.

 After command completion occurred, registers were:
 ER ST SC SN CL CH DH
 -- -- -- -- -- -- --
40 51 04 c7 b6 d5 ea Error: UNC 4 sectors at LBA = 0x0ad5b6c7 = 181778119

 Commands leading to the command that caused the error were:
 CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
 -- -- -- -- -- -- -- --  ----------------  --------------------
 c8 00 04 c7 b6 d5 ea 00      15:49:49.473  READ DMA
 c8 00 04 9b b4 e1 ea 00      15:49:49.220  READ DMA
 c8 00 04 97 b4 e1 ea 00      15:49:52.420  READ DMA
 c8 00 04 a7 b4 e1 ea 00      15:49:52.175  READ DMA
 c8 00 04 a3 b4 e1 ea 00      15:49:51.929  READ DMA

Error 7739 occurred at disk power-on lifetime: 16008 hours (667 days + 0 hours) When the command that caused the error occurred, the device was active or idle.

 After command completion occurred, registers were:
 ER ST SC SN CL CH DH
 -- -- -- -- -- -- --
40 51 04 c7 b6 d5 ea Error: UNC 4 sectors at LBA = 0x0ad5b6c7 = 181778119

 Commands leading to the command that caused the error were:
 CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
 -- -- -- -- -- -- -- --  ----------------  --------------------
 c8 00 04 c7 b6 d5 ea 00      11:35:56.771  READ DMA
 35 00 20 bf e7 39 40 00      11:35:56.765  WRITE DMA EXT
 35 00 20 7f 6b 2e 40 00      11:35:56.749  WRITE DMA EXT
 35 00 20 3f 0d c7 40 00      11:35:56.740  WRITE DMA EXT
 35 00 20 1f 4f c1 40 00      11:35:56.732  WRITE DMA EXT

Error 7738 occurred at disk power-on lifetime: 15989 hours (666 days + 5 hours) When the command that caused the error occurred, the device was active or idle.

 After command completion occurred, registers were:
 ER ST SC SN CL CH DH
 -- -- -- -- -- -- --
40 51 04 c7 b6 d5 ea Error: UNC 4 sectors at LBA = 0x0ad5b6c7 = 181778119

 Commands leading to the command that caused the error were:
 CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
 -- -- -- -- -- -- -- --  ----------------  --------------------
 c8 00 04 c7 b6 d5 ea 00      16:16:27.719  READ DMA
 c8 00 04 9b b4 e1 ea 00      16:16:27.468  READ DMA
 c8 00 04 97 b4 e1 ea 00      16:16:30.682  READ DMA
 c8 00 04 a7 b4 e1 ea 00      16:16:30.440  READ DMA
 c8 00 04 a3 b4 e1 ea 00      16:16:30.174  READ DMA

Looks like you disk is on its way out, from the look of the above errors, I would try dd'ing the disk onto a new disk the running an fsck to make sure everything is ok. I wouldnt hold out much hope for recovering the data on that sector though.

Tom J

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