Re: fsck unable to read disk sectors

On 3/29/10, Alexander Best <alexbestms_at_wwu.de> wrote:
> hi there,
>
> when doing fsck on my / fs i get this error:
>
> "Cannot Read BLK. 471617640" and "The Following Disk Sectors could not be
> read: 471617643". after this message the partition gets marked dirty.
>
> i performed the following steps to verify the problem:
>
> 1) dd if=/dev/ada0 of=/dev/null bs=1m
> 2) fsck / under freebsd 7
> 3) mount -u -o snapshot /.snap/snapshot1 / && fsck_ffs /.snap/snapshot1
>
> all three steps showed no problem with that harddrive whatsoever. also
> smartd
> doesn't complain about anything.
>
> i'm running HEAD (r205860) on amd64.
>
> this is the output of `dmesg -a|grep ada0`:
>
> ada0 at ahcich2 bus 0 scbus3 target 0 lun 0
> ada0: <SAMSUNG SP2504C VT100-50> ATA-7 SATA 2.x device
> ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
> ada0: Command Queueing enabled
> ada0: 238474MB (488395055 512 byte sectors: 16H 63S/T 16383C)

Last time I tried ahci on dead disk it did not complained at all
(usually I get dead LBA listed on console).