Hi

If half the disk is un-used, there's a *lot* of space to move the directory 
sectors off to as they wear ...

>From past experience frying these parts (been there done that), the magic 
>"failure" point is simply time it takes the average cell to hit a certain bit 
>error rate. Some get further others don't. Since they all are doing error 
>checking to catch and correct the failure, the "death spiral" is pretty slow. 
>The controller should be able to keep up with it.

Bob


On Feb 3, 2010, at 2:45 AM, Ralph Green wrote:

> Howdy,
> If you are careful to not do more than one write to each sector per
> day, you should make it.  An MLC cell should take 10000 writes.  20
> years is 7305 days, so there is no room for 2 writes per day.
>  If you write to a normal filesystem, the directory sectors are not
> going to survive.  Even with wear leveling, there will be too many
> writes.
> Good luck,
> Ralph
> 
> On Tue, 2010-02-02 at 18:08 -0500, Bob Camp wrote:
>> Hi
>> 
>> If I can re-write the entire disk once a day for 20 years, that's good 
>> enough for what I'm doing. 
> 
> 

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