errors from external USB disk

[Wolfgang Hukriede]

El día Fri Feb 28 03:29:04 UTC 2014, Polytropon freebsd at edvax.de escribió:

> Probably the disk has exceeded its natural life time. :-)

Not necessarily.

> You are correct. The firmware maps defective blocks as long as
> there are spare blocks available. When the problem starts "bubbling
> up" to the I/O subsystem of the OS, it's usually out of spare
> blocks, which means that there are more than enough defects.

Afaik, the disk doesn't remap the bad sectors unless you're writing
to them. Doing otherwise would make the error pass by unnoticed, not
a good idea at all.

So Matthias was spot-on writing zeroes to the sectors in question.

I saved at least one disk this way myself.

Greetings, whukriede