[Fwd: Power Down]

Vipin Malik vmalik at danielind.com
Wed Dec 8 16:39:23 EST 1999

David Woodhouse wrote:
> rcanup at go2fax.com said:
> >  Vipin's original post said that he saw bad sectors about once in
> > every 250 power down cycles. Oran is telling us that can't occur.
> At the block device level, that definitely shouldn't occur. The ext2 may of
> course get confused, but that's why you should be using ext3 on it if you ever
> expect it to lose power.

I can gurantee you that it did with at least 3 or 4 IDE2000 disks that I
tested. Also with a couple of compact flash disks that I tested. The
compact flash were so bad (1 in about 4 problems on power downs) that I
just gave up on those as completely unacceptable.

> > Of course if my analysis is correct then you are safe to erase the bad
> > sector - it was the last one being written; the file system would then
> > be left in a state in which e2fsck could hopefully repair it.
> With NFTL, that's definitely the way it's designed. You write the data, write
> the ECC checksum, and then mark it valid. The old version of that block remains
> on the media until it's later reclaimed.
> If you are interrupted during a write, it's obvious and can be fixed.

Is this functionality already there in the drivers on the web site. Has
this been tested during power downs during writes to flash?

> --
> dwmw2
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