How severe is IDNF errors in SMART log?

[Norberto Meijome]

hi all,
I have a laptop with a 100GB Hitachi SATA drive. the SMART log shows
the errors below (via 'sudo smartctl -a /dev/ad0' ). How badly damaged
is the disk?

[...]
Error 65535 occurred at disk power-on lifetime: 214 hours (8 days + 22
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
  -- -- -- -- -- -- --
  10 51 08 50 11 00 e0  Error: IDNF 8 sectors at LBA = 0x00001150 = 4432

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  35 03 08 50 11 00 e0 00   2d+21:25:42.300  WRITE DMA EXT
  35 03 08 48 11 00 e0 00   2d+21:25:42.200  WRITE DMA EXT
  35 03 08 40 11 00 e0 00   2d+21:25:42.100  WRITE DMA EXT
  35 03 08 38 11 00 e0 00   2d+21:25:42.100  WRITE DMA EXT
  35 03 08 30 11 00 e0 00   2d+21:25:42.000  WRITE DMA EXT

Error 65534 occurred at disk power-on lifetime: 214 hours (8 days + 22
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
  -- -- -- -- -- -- --
  10 51 08 48 11 00 e0  Error: IDNF 8 sectors at LBA = 0x00001148 = 4424

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  35 03 08 48 11 00 e0 00   2d+21:25:42.200  WRITE DMA EXT
  35 03 08 40 11 00 e0 00   2d+21:25:42.100  WRITE DMA EXT
  35 03 08 38 11 00 e0 00   2d+21:25:42.100  WRITE DMA EXT
  35 03 08 30 11 00 e0 00   2d+21:25:42.000  WRITE DMA EXT
  35 03 08 28 11 00 e0 00   2d+21:25:42.000  WRITE DMA EXT

[....]
(about 6 times, different LBA ranges, always 8 sectors, always WRITE
DMA EXT)

thanks!
Beto