On Mon, Mar 07, 2005 at 07:26:53PM +0100, Manuel Bouyer scribed:
> On Mon, Mar 07, 2005 at 03:55:43PM +0300, Denis Lagno wrote:
> > Hi,
> > 
> > I encountered bad sector on my disk during dump:
> > 
> > wd0g: error reading fsbn 237235392 of 237235392-237235455 (wd0 bn 268435455; cn 266305 tn 0 sn 15)
> > wd0: (id not found)
> > 
> > First question: what kind of error is this (id not found)?
> 
> hardware error, most probably. Unfortunably there are way to few error codes
> in the ATA interface to have the drive report interesting details.
> You may get more infos from atactl smart, if the drive supports it.

hmm, it seems to be very weird error.  After it occured I read the whole
partition with dd if=/dev/wd0g of=/dev/null bs=1m
and I encountered no error.  Then I tried to redo the dump.
And it failed again at the same place:

  DUMP: readBlocks: read fails: Input/output error
  DUMP: read error from /dev/rcgd3h: Input/output error: [block 183235392]: count=10240
  DUMP: read error from /dev/rcgd3h: Input/output error: [sector 183235392]: count=512
  DUMP: readBlocks: read fails: Input/output error
  DUMP: readBlocks: read fails: Input/output error
  DUMP: readBlocks: read fails: Input/output error
  DUMP: readBlocks: read fails: Input/output error

Mar  9 23:53:03 flam /netbsd: wd0g: error reading fsbn 237235392 of 237235392-237235455 (wd0 bn 268435455; cn 266305 tn 0 sn 15), retrying
Mar  9 23:53:03 flam /netbsd: wd0: (id not found)
Mar  9 23:53:04 flam /netbsd: wd0g: error reading fsbn 237235392 of 237235392-237235455 (wd0 bn 268435455; cn 266305 tn 0 sn 15)wd0: (id not found)
Mar  9 23:53:04 flam /netbsd:
Mar  9 23:53:04 flam /netbsd: cgd3: error 5

Then I again try to reproduce it with dd and see no errors:

# dd if=/dev/rcgd3h of=/dev/null seek=183235392 bs=512 count=100
100+0 records in
100+0 records out
51200 bytes transferred in 0.047 secs (1089361 bytes/sec)

# dd if=/dev/wd0g of=/dev/null seek=237235392 bs=512 count=100
100+0 records in
100+0 records out
51200 bytes transferred in 0.024 secs (2133333 bytes/sec)

Wonder, how can it be so..