Date: Mon, 16 May 2005 18:42:30 +0200
From: Pavel Machek <pavel@ucw.cz>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Mark Lord <lkml@rtr.ca>, Denis Vlasenko <vda@ilport.com.ua>,
       mhw@wittsend.com, linux-kernel@vger.kernel.org
Subject: Re: Sync option destroys flash!
Message-ID: <20050516164230.GA1762@elf.ucw.cz>
References: <1116001207.5239.38.camel@localhost.localdomain> <200505152200.26432.vda@ilport.com.ua> <4287E807.6070502@rtr.ca> <1116235789.25594.19.camel@localhost.localdomain>
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Hi!

> > All flashcards (other than dumb "smart media" cards) have integrated
> > NAND controllers which perform automatic page/block remapping and
> > which implement various wear-leveling algorithms. Rewriting "Sector 0"
> > 10000 times probably only writes once to the first sector of a 1GB card.
> > The other writes are spread around the rest of the card, and remapped
> > logically by the integrated controller.
> 
> Assuming the firmware of the card is written with a modicum of clue,
> this is true. It's not clear how valid that assumption is, in the
> general case. There are reports of cards behaving as if they have almost
> no wear levelling at all.

I have seen card marked "3.3V/5V", but it only really worked on
3.3V. Linux used 5V and quickly killed it.
								Pavel
-- 
Boycott Kodak -- for their patent abuse against Java.
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