Hi,
On Thu, Apr 13, 2000 at 07:03:53PM -0500, Ed Carp wrote:
>
> > > Most modern disks do this for you *transparently* - the driver doesn't even
> > > see the error, so this does't really apply. If the kernel sees an error, it's
> > > a real error, as opposed to one that has been remapped.
> >
> > Not quite. If you get a read error, the drive will do the remapping
> > for you such that future writes to the same sector will be mapped
> > elsewhere on disk. However, that transparent remapping cannot, by
> > itself, restore the contents of the lost sector. The kernel will
> > still see the read error --- it's only future contents of the same
> > logical sector which will be remapped.
>
> "Real", not "read". What you are saying is true only for reads - for writes, the write is transparently redirected.
You were talking about "real errors" and "transparently remapped" as
if they were mutually exclusive. They are not --- not quite. A true
read error causes a transparent remapping at the same time. It's just
that the remap doesn't take effect until the next write: the bad
sector is still marked by the drive immediately.
--Stephen
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