Number of ECC bytes

Rod Van Meter rdv at
Sun Sep 21 14:09:07 PDT 2008

* From the T10 Reflector (t10 at, posted by:
* Rod Van Meter <rdv at>
On Thu, 2008-09-18 at 13:57 -0500, Gerry.Houlder at wrote:
> * From the T10 Reflector (t10 at, posted by:
> * Gerry.Houlder at
> *
> The READ LONG mechanism is the only standard method that even hints at the
> number of ECC bytes per LBA. Its a very good bet that [READ LONG returned
> data length] - [logical block length] - [protection information length if
> implemented] = [number of ECC bytes]. Even if you know the number of bytes
> you still don't know what error correction capability is indicated because
> this varies according to the algorithm, interleaving, and other
> characteristics of ECC.
Not to mention the actual error processes, and their relationship to the
error model assumed in the error management design (which, as noted, is
a lot more than just choosing an ECC code).
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