[Coco] Re: flash memory

[jdaggett at gate.net]

Mike K

Depending on manufacturer and size of the Flash the erase/write 
cycles can now be between 100,000 to 1,000,000 cycles. FYI

Back in 1999 on a project I worked on, we were finding that ST 
Micro claimed their 4 Mbit Flash would do 100,000 erase/write 
cycles. We actually found some,<2%, would fail after about 10,000 
times. 

james

On 25 Jan 2004 at 21:01, KnudsenMJ at aol.com wrote:

From:           	KnudsenMJ at aol.com
Date sent:      	Sun, 25 Jan 2004 21:01:32 EST
Subject:        	Re: [Coco] Re: flash memory
To:             	coco at maltedmedia.com
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> In a message dated 1/25/04 11:42:57 AM Eastern Standard Time, 
> PaulH96636 at aol.com writes:
> 
> > It might be informative to ask those current members who have used
> > Boisey's 
> >  flash
> >  memory adapter for the IDE controller if they've experienced any
> >  problems after extended usage with OS-9, which can give drives a
> >  rigorous workout.
> 
> I believe all flash memories have a specified expected number of
> erase-and-rewrite cycles, so heavy usage (like a hard-working
> photographer, or an OS-9 RAM drive) could shorten the life expectancy.
> 
> Not clear why the Mars rover would wear out its program flash memory,
> since it should be read-only and execute-only.  However, the 60 or so
> reboots that Spirit had done before the human masters told it to cool
> it, probably took some life off the chips.  Although the expected
> number of cycles allowed is something like 400K. --Mike K.
> 
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