From owner-freebsd-fs@FreeBSD.ORG Fri Mar 2 16:29:10 2012 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id D53AF106567C for ; Fri, 2 Mar 2012 16:29:10 +0000 (UTC) (envelope-from fjwcash@gmail.com) Received: from mail-vw0-f54.google.com (mail-vw0-f54.google.com [209.85.212.54]) by mx1.freebsd.org (Postfix) with ESMTP id 7AAA18FC23 for ; Fri, 2 Mar 2012 16:29:10 +0000 (UTC) Received: by vbmv11 with SMTP id v11so2034022vbm.13 for ; Fri, 02 Mar 2012 08:29:09 -0800 (PST) Received-SPF: pass (google.com: domain of fjwcash@gmail.com designates 10.52.31.42 as permitted sender) client-ip=10.52.31.42; Authentication-Results: mr.google.com; spf=pass (google.com: domain of fjwcash@gmail.com designates 10.52.31.42 as permitted sender) smtp.mail=fjwcash@gmail.com; dkim=pass header.i=fjwcash@gmail.com Received: from mr.google.com ([10.52.31.42]) by 10.52.31.42 with SMTP id x10mr17364074vdh.33.1330705749536 (num_hops = 1); Fri, 02 Mar 2012 08:29:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=F1IrIKVXFfNSF4ofEHF/MfpfASpcAFncYUIlF+FpMhE=; b=bPogz1gO4tTr5omO7oA8lCWC17meL4rAHvnxFOb5m+MMF/Z225tfZcx+LDi327CHUy NKCCRHqh+ixHpl2EFrubW6NwlSC48UQp09BdiJn1yqkr7aB4HM/OnwfuUyI67s7sarrO GH5b42plKWPhjuzkcgFiHGAMWw7GykGrpc4VoTk0yyLKG2Cdcnc7FBhC+a993pDCCJl9 6zFGEcFdQ4R5CcWVKZ1YBImd99P0uQfDWj3JhbeZ0RAPHVfd85OjMlBcdKyYpBAKjBxg ik3xCdvXFVEZ4OjTbDM2XNt+yr6bUHuDislFA2XI3kAkV/cpszyBAE86y3AXrto6X+ii Olzg== MIME-Version: 1.0 Received: by 10.52.31.42 with SMTP id x10mr14770150vdh.33.1330705749473; Fri, 02 Mar 2012 08:29:09 -0800 (PST) Received: by 10.220.178.74 with HTTP; Fri, 2 Mar 2012 08:29:09 -0800 (PST) In-Reply-To: References: <4F4FC3E1.5040700@freebsdfoundation.org> <201203021530.q22FUjOU040478@fire.js.berklix.net> Date: Fri, 2 Mar 2012 08:29:09 -0800 Message-ID: From: Freddie Cash To: "Julian H. Stacey" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: freebsd-fs@freebsd.org, Deb Goodkin Subject: Re: [FreeBSD-Announce] Foundation Announces NAND File System for FreeBSD Project X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Mar 2012 16:29:10 -0000 On Fri, Mar 2, 2012 at 8:28 AM, Freddie Cash wrote: > On Fri, Mar 2, 2012 at 7:30 AM, Julian H. Stacey wrote: >> Hi freebsd-fs@freebsd.org >> cc Deb >> >> Deb Goodkin wrote to announce@ Thu, 01 Mar 2012 11:45:53 -0700 (19:45 CE= T): >>> The FreeBSD Foundation is pleased to announce that Semihalf, an >> ... >> >> I was interested to read more background, but no URLs, >> so I found http://www.semihalf.com/ & re. >> =C2=A0 =C2=A0 =C2=A0 =C2=A0NAND Flash File System >> found: >> =C2=A0http://en.wikipedia.org/wiki/Flash_memory#NAND_flash >> =C2=A0 =C2=A0 =C2=A0 =C2=A0"Manufacturers try to maximize the amount of = usable storage >> =C2=A0 =C2=A0 =C2=A0 =C2=A0by shrinking the size of the transistor below= the size where >> =C2=A0 =C2=A0 =C2=A0 =C2=A0they can be made reliably, to the size where = further >> =C2=A0 =C2=A0 =C2=A0 =C2=A0reductions would increase the number of fault= s faster than >> =C2=A0 =C2=A0 =C2=A0 =C2=A0it would increase the total storage available= ." >> =C2=A0 =C2=A0 =C2=A0 =C2=A0- >> =C2=A0 Really scarey if that is taken literaly, I jhs@ presume loose phr= aseology, >> =C2=A0 =C2=A0 =C2=A0 =C2=A0hopefully someone who knows more will rephras= e that :-). > > A good primer on NAND Flash with lots of info on "the next hot thing", > triple-level cell (TLC) flash, which has all the flaws of MLC > multiplied many times over, but is a lot less expensive to use/make, > so expect it to hit consumer drives this year. =C2=A0:( =C2=A0Page 3 is > extremely enlightening about the issues, especially regarding the > increased CRC requirements in order to actually read a valid bit from > the cell. Let's try actually including the link this time: http://www.anandtech.com/show/5067/understanding-tlc-nand --=20 Freddie Cash fjwcash@gmail.com