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!
Date: Mon, 16 May 2005 18:42:30 +0200 [thread overview]
Message-ID: <20050516164230.GA1762@elf.ucw.cz> (raw)
In-Reply-To: <1116235789.25594.19.camel@localhost.localdomain>
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.
next prev parent reply other threads:[~2005-05-16 17:06 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-13 16:20 Sync option destroys flash! Michael H. Warfield
2005-05-13 17:17 ` Lennart Sorensen
2005-05-13 17:53 ` Michael H. Warfield
2005-05-13 18:09 ` Lennart Sorensen
2005-05-13 18:21 ` Michael H. Warfield
2005-05-13 18:26 ` Lennart Sorensen
2005-05-13 18:52 ` Flash device types Mark Rustad
2005-05-13 18:53 ` Sync option destroys flash! Michael H. Warfield
2005-05-13 17:58 ` Zan Lynx
2005-05-13 18:13 ` Lennart Sorensen
2005-05-13 18:40 ` Alan Cox
2005-05-13 19:10 ` Michael H. Warfield
2005-05-13 22:00 ` Alan Cox
2005-05-13 22:22 ` Måns Rullgård
2005-05-13 23:24 ` Jon Masters
2005-05-13 23:01 ` Jeffrey Hundstad
2005-05-13 23:27 ` Jon Masters
2005-05-14 10:17 ` Jörn Engel
2005-05-14 1:05 ` Michael H. Warfield
2005-05-17 13:30 ` Lennart Sorensen
2005-05-13 21:25 ` Lee Revell
2005-05-13 22:43 ` Alan Cox
2005-05-15 19:00 ` Denis Vlasenko
2005-05-16 0:23 ` Mark Lord
2005-05-16 9:29 ` David Woodhouse
2005-05-16 16:42 ` Pavel Machek [this message]
2005-05-16 13:01 ` Richard B. Johnson
2005-05-16 23:18 ` Helge Hafting
2005-05-18 7:03 ` Denis Vlasenko
2005-05-17 7:59 ` Colin Leroy
[not found] <43Ldl-NM-25@gated-at.bofh.it>
[not found] ` <43M9s-1B8-39@gated-at.bofh.it>
[not found] ` <43MCx-1UF-27@gated-at.bofh.it>
[not found] ` <43MVz-2hL-1@gated-at.bofh.it>
2005-05-13 23:59 ` Robert Hancock
-- strict thread matches above, loose matches on Subject: below --
2005-05-14 2:43 linux
2005-05-17 13:36 ` Lennart Sorensen
2005-05-17 20:31 ` linux
2005-05-17 20:43 ` Richard B. Johnson
2005-05-18 13:37 ` Lennart Sorensen
[not found] <43UT5-jT-3@gated-at.bofh.it>
2005-05-14 4:34 ` Robert Hancock
2005-05-18 11:13 linux
2005-05-18 12:01 ` Richard B. Johnson
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