Re: Blockbusting news, results are in

[Thayne Harbaugh]

On Sun, 2003-10-19 at 02:41, Rogier Wolff wrote:
> On Sun, Oct 19, 2003 at 12:17:16PM +0400, Hans Reiser wrote:
> > What are the common sources of data corruption, is one of them that the 
> > drive head starts bumping the media more and more often because a 
> > bearing (or something) has started to show signs of wear?
> 
> I'm not sure if the manufacturer knows. Datarecovery companies
> know. 
> 
> Sources of dataloss are: 
> 
> 	- Software
> 	- crooked platters (especially on laptop drives)
> 	- heads bouncing on platter
> 	- broken electronics. 

I experienced a fun problem where high-CFM fans in a 1u chassis caused
extreme vibration.  This vibration caused errors in the drive and
resulted in large numbers of failures using badblocks as a testing
tool.  When the vibration was removed the failures disappeared.  Another
symptom of the vibration was _very_ low disk performance <10% normal.

I couldn't get a straight answer from the drive manufacturer about how
the reallocation table worked.  The short answer was that they were the
only ones that could reset the reallocation table.

-- 
Thayne Harbaugh
Linux Networx

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