# RE: NAND BBT corruption on MPC83xx

- From: Mike Hench \<hidden\>
- Date: 2011-06-18 18:10:07 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2011/06/9465015
- Thread: https://ratatoskr.run/linuxppc-dev/2011/06/9464994/t.md

```text
Scott Wood wrote:
> As for the corruption, could it be degradation from repeated reads of
that
> one page?

Read Disturb. I Did not know SLC did that.
It just takes 10x as long as MLC, on the order of a million reads.
Supposedly erasing the block fixes it.
It is not a permanent damage thing.
I was seeing ~9 hours before failure with heavy writes.
~4GByte/hour =3D 2M pages, total ~18 million reads before errors in that
last block showed up.

Cool. Now we know.
Thanks.

Mike Hench
```