From: David Brown <mtd@davidb.org>
To: Ricard Wanderlof <ricard.wanderlof@axis.com>
Cc: "Jörn Engel" <joern@logfs.org>,
"Linux mtd" <linux-mtd@lists.infradead.org>
Subject: Re: Some news for this: [PATCH] [MTD] BLOCK_RO: Readonly Block Device Layer Over MTD ?
Date: Fri, 23 Nov 2007 10:40:29 -0800 [thread overview]
Message-ID: <20071123184029.GA11033@old.davidb.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0711231026510.523@lnxricardw.se.axis.com>
On Fri, Nov 23, 2007 at 10:28:24AM +0100, Ricard Wanderlof wrote:
>On second thought, I think that the degradation of the data in a
>flash memory cell is mostly due to read operations, so if no read
>operations are performed, the data should be fairly secure. Then again,
>there are subtle effects such as cosmic radiation flipping bits at any
>random location, etc.
Flash should be reasonably immune to degradation from reads. In fact, it
is fairly resiliant to degradation at all.
In NAND, the primary cause of read failures is caused by writes (and
rewrites) of subsequent pages within a block. These can cause bit flips in
earlier written pages. This gets worse with higher density, and is the
main reason the higher density devices have greater restrictions on
rewrites.
David
next prev parent reply other threads:[~2007-11-23 18:40 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-21 14:27 Some news for this: [PATCH] [MTD] BLOCK_RO: Readonly Block Device Layer Over MTD ? Gregory CLEMENT
2007-11-21 16:08 ` Jörn Engel
2007-11-21 16:28 ` Gregory CLEMENT
2007-11-21 16:58 ` Josh Boyer
2007-11-21 17:07 ` Gregory CLEMENT
2007-11-21 17:13 ` Josh Boyer
2007-11-21 17:15 ` Jörn Engel
2007-11-21 17:32 ` Gregory CLEMENT
2007-11-21 17:43 ` Vitaly Wool
2007-11-21 17:45 ` Jörn Engel
2007-11-21 17:56 ` Vitaly Wool
2007-11-21 18:04 ` Jörn Engel
2007-11-23 14:35 ` Gregory CLEMENT
2007-11-23 14:45 ` Jörn Engel
2007-11-23 15:06 ` Gregory CLEMENT
2007-11-21 20:46 ` Ricard Wanderlof
2007-11-21 21:32 ` Jörn Engel
2007-11-21 22:33 ` Gregory CLEMENT
2007-11-21 22:54 ` Jörn Engel
2007-11-22 7:58 ` Ricard Wanderlof
2007-11-22 13:26 ` Jörn Engel
2007-11-23 7:42 ` Ricard Wanderlof
2007-11-23 8:18 ` Artem Bityutskiy
2007-11-23 9:08 ` Ricard Wanderlof
2007-11-23 9:21 ` Artem Bityutskiy
2007-11-23 9:28 ` Ricard Wanderlof
2007-11-23 18:40 ` David Brown [this message]
2007-11-26 9:42 ` Ricard Wanderlof
2007-11-26 13:58 ` Claudio Lanconelli
2007-11-23 8:19 ` Artem Bityutskiy
2007-11-23 12:46 ` Jörn Engel
2007-11-22 7:58 ` Ricard Wanderlof
2007-11-22 13:08 ` Jamie Lokier
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