errors from external USB disk

Polytropon freebsd at
Fri Feb 28 03:31:43 UTC 2014

On Thu, 27 Feb 2014 19:32:48 +0100, Matthias Apitz wrote:
> The bad block is there; if I restart the reading from 10 blocks before this
> point, it stops at the same block:
> # dd if=/dev/da0 of=/dev/null bs=1m skip=712860
> dd: /dev/da0: Input/output error
> 10+0 records in
> 10+0 records out
> 10485760 bytes transferred in 4.017767 secs (2609848 bytes/sec)

Maybe you can use the "badblocks" tool provided by FreeBSD
so this block can be "skipped". However, seeng this error
often indicates that there are more bad blocks around the
corner. :-)

Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...

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