Re: /netbsd: wd0a: error reading fsbn?

[scole_mail <scole_mail%gmx.com@localhost>]

On Thu, Jan 07, 2016 at 02:26:33PM -0500, Greg Troxel wrote:
> 
> scole_mail <scole_mail%gmx.com@localhost> writes:
> 
> > /netbsd: wd0a: error reading fsbn 3522624 of 3522624-3522751 (wd0 bn 3522687; cn 3494 tn 11 sn 42), retrying
> > /netbsd: wd0: (uncorrectable data error)
> 
> This basically means that your disk is going bad, because it has an
> unreadable sector.
> 
> You can write zeros to that sector with dd (very carefully!).  But, once
> a disk behaves like this, it can't be trusted, and should be replaced.
> Even if smartctl says it is ok.

Thank you for that info.  I guess I will trudge along until it dies or
becomes unusable.  

I did try

	dd if=/dev/rwd0d seek=3522687 count=1 of=foo

but that did not generate any kernel errors or messages.

I originally wondered if the error could be caused by sort of large
files (~50gig) or files originally being copied from a mac os file system with 
ssh/tar:
	ssh macos-host 'cd somewhere ; tar cf - . ' | tar xvf -

Thanks