From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1MUz1J-0002nF-Jc for garchives@archives.gentoo.org; Sun, 26 Jul 2009 08:23:50 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 19079E02D6; Sun, 26 Jul 2009 08:23:47 +0000 (UTC) Received: from mail-gx0-f220.google.com (mail-gx0-f220.google.com [209.85.217.220]) by pigeon.gentoo.org (Postfix) with ESMTP id E4594E02D6 for ; Sun, 26 Jul 2009 08:23:46 +0000 (UTC) Received: by gxk20 with SMTP id 20so11641606gxk.10 for ; Sun, 26 Jul 2009 01:23:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:from:to:subject:date :user-agent:references:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:message-id; bh=f5uQdDGd40dmomBsq6Smhlmh0V7aCpa81z16mSpNVSY=; b=oKhDYUgN6fP87E63o8+y1GUh39BVj5tJ9EYZRpBdzpIUaqVAbRBuarWlh/NnsxrZHH +MG1LPMTj9QoGGn+ZuYTgts7fzZ0FUOGd9yEaE8ot7W70EuUy4UbCS3owV00qRuZK4nD SIBhRB2glv9cj6xRqEnAL0IL9tJJA2nD4L88E= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:subject:date:user-agent:references:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :message-id; b=aaBKjcMQb0GWgzixUPpjSUSIpUJPXhEWr2fFIvO3tNy1epAKFDdbU04pD2NczmUIGC Rj7UhEbzqW9iQx9uewnslUylv6nfhrN0a7PChR2+EJcvCXkTYkrjuzb+OrvkaxtJvccR HzV1oFFCEAcKZPOxqoNYLp+GEz0W0wZA46ac4= Received: by 10.151.102.16 with SMTP id e16mr8729840ybm.51.1248596190273; Sun, 26 Jul 2009 01:16:30 -0700 (PDT) Received: from nazgul.localnet ([196.210.202.145]) by mx.google.com with ESMTPS id 20sm1017017ywh.13.2009.07.26.01.16.28 (version=SSLv3 cipher=RC4-MD5); Sun, 26 Jul 2009 01:16:29 -0700 (PDT) From: Alan McKinnon To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] Re: File synchronisation utility (searching for/about to program it) Date: Sun, 26 Jul 2009 10:15:04 +0200 User-Agent: KMail/1.11.4 (Linux/2.6.30-gentoo-r4; KDE/4.2.4; x86_64; ; ) References: <5f14cf5e0907220809ud14a99dq81950fba1c45b495@mail.gmail.com> <7bef1f890907241943k7c6a6fckb79a90816cae280f@mail.gmail.com> In-Reply-To: Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200907261015.04889.alan.mckinnon@gmail.com> X-Archives-Salt: ebe0ca9a-69b3-428d-962c-606aef9cacab X-Archives-Hash: a9fbb4ba4b30e5d5e70fd717ed340d36 On Saturday 25 July 2009 16:56:57 walt wrote: > On 07/24/2009 07:43 PM, Alan E. Davis wrote: > > ...I am using a flash drive as a cache, so to speak... > > I recently learned that flash drives wear out after about > 10,000 write operations, which came as an unpleasant surprise. That's a gross over-simplification of reality. Individual elements of a flash drive will eventually wear out - they are not infinitely over-writable. The ultra-super-duper-cheapie crap ones average out at about 10,000 writes per cell, meaning that's the point where the manufacturer won't guarantee much. You may well get more on such a device in practice. Decent drives go up to 100,000 writes before cell failures become statistically significant > Just be aware that you are drastically shortening the life of > a flash drive by writing to it frequently. (or so I've read) Which is why you should use wear-levelling -- alan dot mckinnon at gmail dot com