From owner-freebsd-arm@freebsd.org Sat Mar 18 14:44:39 2017 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 63C21D12023 for ; Sat, 18 Mar 2017 14:44:39 +0000 (UTC) (envelope-from rj@obsigna.com) Received: from mo6-p00-ob.smtp.rzone.de (mo6-p00-ob.smtp.rzone.de [IPv6:2a01:238:20a:202:5300::11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "*.smtp.rzone.de", Issuer "TeleSec ServerPass DE-2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 019DE1A5A for ; Sat, 18 Mar 2017 14:44:38 +0000 (UTC) (envelope-from rj@obsigna.com) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1489848274; l=841; s=domk; d=obsigna.com; h=Mime-Version:To:Date:Subject:Content-Transfer-Encoding:Content-Type: From; bh=ZKgU1COyl/5BBwJTtgRzS2cvTmxXlwtfIajlsdsWc40=; b=RR2410gNpqFWOcjGitcxyTz0gZR/jjWKkqxMy7l/xNjD4hbV047pC1AgUIBq1NyOXY ADJkAZWhpLfkkTKQJ5jPjtDBwoNlQzZcrL1m786TvzTSdIN2fGcfuELXF+L0jweynD84 2qVZnzDY72NS//U0/xgTzTD27QyCifFxgVqk0= X-RZG-AUTH: :O2kGeEG7b/pS1EK7WHa0hxqKZr4lnx6UhT0M0o35iAdWtoM07Gt3wQHFGh0n99Hk6LY= X-RZG-CLASS-ID: mo00 Received: from mail.obsigna.com (bb02b8ae.virtua.com.br [187.2.184.174]) by smtp.strato.de (RZmta 40.1 DYNA|AUTH) with ESMTPSA id K03c82t2IEiXA1h (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (curve secp521r1 with 521 ECDH bits, eq. 15360 bits RSA)) (Client did not present a certificate) for ; Sat, 18 Mar 2017 15:44:33 +0100 (CET) Received: from rolf.projectworld.net (rolf.projectworld.net [192.168.222.15]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.obsigna.com (Postfix) with ESMTPSA id EF10B7506DAD for ; Sat, 18 Mar 2017 11:44:27 -0300 (BRT) From: "Dr. Rolf Jansen" Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Subject: Identifying counterfeit microSD cards on a Beaglebone Black Message-Id: Date: Sat, 18 Mar 2017 11:44:28 -0300 To: freebsd-arm@FreeBSD.org Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) X-Mailer: Apple Mail (2.1878.6) X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 18 Mar 2017 14:44:39 -0000 I bought a 16 GB microSDHC SanDisk chip rated at 4 MB/s write speed for = use with my Beaglebone Black.=20 The internal flash offers practical write speeds in the range of 2 to 3 = MB/s when copying data to it from a NFSv4 volume depending on the size = of the files being copied. Executing the same copy operation with said = microSDHC card as the target I see only 0.1 to 0.2 MB/s (less than = 1/10). I suspect now that I got a counterfeited card. Before I dump it, I would = like to run a definitive non-destructive test, preferably on the = Beaglebone Black, and I would like to ask you for suggestions. Also, it would be nice to see some speed values as a reference for = microSDHC card write speeds on: FreeBSD 12.0-CURRENT (BEAGLEBONE) #0 r315413 Many thanks in advance for any help. Best regards Rolf=