Crash systemu - dead hdd?

Witam,
kilka dni temu miałem crash systemu (UbuntuLinux).
Poniżej ostatnie wpisy w syslog:
Jul 1 20:19:25 localhost kernel: hdb: dma_intr: status=0x51 {DriveReady
SeekComplete Error }
Jul 1 20:19:25 localhost kernel: hdb: dma_intr: error=0x84
{DriveStatusError BadCRC }
Jul 1 20:19:25 localhost kernel: ide: failed opcode was: unknown
Jul 1 20:31:17 localhost kernel: hdb: dma_intr: status=0x51 {DriveReady
SeekComplete Error }
Jul 1 20:31:17 localhost kernel: hdb: dma_intr: error=0x84
{DriveStatusError BadCRC }
Jul 1 20:31:17 localhost kernel: ide: failed opcode was: unknown
Jul 1 21:09:49 localhost kernel: hdb: dma_intr: status=0x51 {DriveReady
SeekComplete Error }
Jul 1 21:09:49 localhost kernel: hdb: dma_intr: error=0x84
{DriveStatusError BadCRC }
Jul 1 21:09:49 localhost kernel: ide: failed opcode was: unknown

Błędy CRC na HDD, myślę sobie - bad sectory. Sprawdzam SMART tego dysku
(smartctl) i mam takie wpisy:
Error 620 occurred at disk power-on lifetime: 2338 hours (97 days + 10
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 00 31 7d 7a 40 Error: UNC at LBA = 0x007a7d31 = 8027441

   Commands leading to the command that caused the error were:
   CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
   -- -- -- -- -- -- -- -- ---------------- --------------------
   25 03 08 2d 7d 7a 40 00 00:01:35.461 READ DMA EXT
   25 03 08 9d 7d 7a 40 00 00:01:35.444 READ DMA EXT
   25 03 30 95 67 24 40 00 00:01:35.444 READ DMA EXT
   25 03 20 a5 0e 1e 40 00 00:01:35.438 READ DMA EXT
   25 03 08 ed 7d 7a 40 00 00:01:35.422 READ DMA EXT

Error 619 occurred at disk power-on lifetime: 2338 hours (97 days + 10
hours)
   When the command that caused the error occurred, the device was
active or idle.
[...]
Error 618 occurred at disk power-on lifetime: 2338 hours (97 days + 10
hours)
   When the command that caused the error occurred, the device was
active or idle.
[...]
Error 617 occurred at disk power-on lifetime: 2325 hours (96 days + 21
hours)
   When the command that caused the error occurred, the device was
active or idle.
[...]
Error 616 occurred at disk power-on lifetime: 2325 hours (96 days + 21
hours)
   When the command that caused the error occurred, the device was
active or idle.
[...]

Pytanka się rodzą:
Co te wpisy ze SMART oznaczają?
Czy to naprawdę są BadSectory?
Nadaje się jeszcze do czegoś ten dysk?

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