From owner-freebsd-arm@freebsd.org Tue Mar 22 03:28:35 2016 Return-Path: Delivered-To: freebsd-arm@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 70D3CAD891D for ; Tue, 22 Mar 2016 03:28:35 +0000 (UTC) (envelope-from fbsd@www.zefox.net) Received: from www.zefox.net (www.zefox.net [69.239.235.194]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 3EC191CAC; Tue, 22 Mar 2016 03:28:35 +0000 (UTC) (envelope-from fbsd@www.zefox.net) Received: from www.zefox.net (localhost [127.0.0.1]) by www.zefox.net (8.14.9/8.14.5) with ESMTP id u2M3SXns085150; Mon, 21 Mar 2016 20:28:33 -0700 (PDT) (envelope-from fbsd@www.zefox.net) Received: (from fbsd@localhost) by www.zefox.net (8.14.9/8.14.5/Submit) id u2M3SWEt085149; Mon, 21 Mar 2016 20:28:32 -0700 (PDT) (envelope-from fbsd) Date: Mon, 21 Mar 2016 20:28:32 -0700 From: bob prohaska To: Ian Lepore Cc: freebsd-arm@freebsd.org, bob prohaska Subject: Re: Effect of partitioning on wear-leveling Message-ID: <20160322032832.GC83908@www.zefox.net> References: <20160321175952.GA83908@www.zefox.net> <1458586884.68920.96.camel@freebsd.org> <20160321221153.GB83908@www.zefox.net> <1458600070.68920.107.camel@freebsd.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1458600070.68920.107.camel@freebsd.org> User-Agent: Mutt/1.4.2.3i X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Mar 2016 03:28:35 -0000 On Mon, Mar 21, 2016 at 04:41:10PM -0600, Ian Lepore wrote: > > Also, it's been my experience that it's impossible to "wear out" an > sdcard. I once ran a program that just wrote random data continuously > at full speed to a 512MB card for several months nonstop. No noticible > effect on the card. I actually still use that card today (in one of > our older products whose filesystem image only needs about 40MB). > > Have you ever checked to see how much of the 512 MB capacity remains? Seems that quite a lot of decay wouldn't show up if you're using less than 10% of the device's capacity. Thank you! bob prohaska