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Date: Fri, 11 Jan 2013 14:47:03 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
Subject: Re: SATA disk disappears
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On Fri, 11 Jan 2013, Wojciech Puchar wrote:

>>> GEOM_MIRROR: Component ada2 (device home1) broken, skipping.
>>> GEOM_MIRROR: Cannot add disk ada2 to home1 (error=22).
>>> 
>>> 
>>> started gmirror rebuild and it now works at full speed.
>>> 
>>> GEOM_MIRROR: Device home1: rebuilding provider ada2.
>>> 
>>> 
>>> What kind of hardware failure may it be? smartctl -a /dev/ada2 shows disk 
>>> is fine.
>> 
>> I had a new WD drive recently that had a write error.  Reallocated sector 
>> count did not go up, but it quickly failed the SMART self-test, short or 
>> long.  See smartctl(8) about the -t parameters.
>> 
> this is WD "green" 3TB

1T Red here.  The firmware is likely very similar.