From: Bob Canup <rcanup@go2fax.com>
To: MTD <mtd@imladris.mvhi.com>
Subject: Re:Power Down
Date: Tue, 07 Dec 1999 15:19:24 -0600 [thread overview]
Message-ID: <384D79DC.8D142064@go2fax.com> (raw)
Watch dogs are generally there to catch the problem of a run-away
machine - this ought to be a very rare occurrence.
According to Vipin's statistics about 1 in 250 random power failures
during writes to a DOC2000 results in a bad sector on the device. Since
you are required to run the chip in RW mode the only way I see to avoid
the problem is a UPS on the front end - with signaling to indicate power
failure so that an ordered shutdown could occur.
As far as the problem of a bad sector which he discussed I have not seen
any solutions other than the erase and start over one he originally came
up with - which for the reasons he discussed - is unacceptable.
The first step toward solving a problem is understanding exactly what
the problem is. My theory is that if you interrupt a sector write while
it is in progress the data and the error checking code don't match -
thus you get a bad sector. Any other theories?
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reply other threads:[~1999-12-07 21:18 UTC|newest]
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