From owner-freebsd-arm@freebsd.org Tue Mar 21 16:25:17 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 4E952D1636E for ; Tue, 21 Mar 2017 16:25:17 +0000 (UTC) (envelope-from lists.br@gmail.com) Received: from mail-wr0-x231.google.com (mail-wr0-x231.google.com [IPv6:2a00:1450:400c:c0c::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id E3F8C2E1 for ; Tue, 21 Mar 2017 16:25:16 +0000 (UTC) (envelope-from lists.br@gmail.com) Received: by mail-wr0-x231.google.com with SMTP id u108so115267536wrb.3 for ; Tue, 21 Mar 2017 09:25:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=0W+7RbBplCqBoFAT841WvL5HGA+qMitw09yHh1DJ140=; b=qRzT1Na6wRt4haPXb4Sn0oYP/x7m6KtSzSqLlcMvVsh2ObBlqI8yVJca8ot+24pH54 G/UHiRA8zho4kdl7xv6xFGH0rkW3m+FbNv1jZ5F/lXL2zA+iJeAVh+B+3kGpXs+jlFpx CgmLcBActvLlOR/VcTE6Ql+HcUvG9D978Zqx47w8N45Nnp4fuxoHfjSYOf2KGdARi7Bt heAFMFDmbN8hv+ozYarHtD9R5XsS1voZxyAT1/ZcWFDTGMnHlduVRAnaqVnf40E3WrJA SOyjeUevA7VrVtf3Eplf7BRiMh4kPW6eBSo6NDlb3jLU1RyrbmJJ2LaE6lzG8N6Rjcne lzTg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=0W+7RbBplCqBoFAT841WvL5HGA+qMitw09yHh1DJ140=; b=MEQag4kPgUt2dyd7xGDPw3k/H98FUzt9VG8pJv8lRIZB1nQNMQCXsKxghnZ44N7liC SbIJfKWG5iiBVq5t2iJ1epAVxdeb3m17Xqe1EgP4WHA8RD6F5svyoPw11KImqo4qb3Sl 25vp9npZaZCtfE+U0Q6FWo0TCAhIX6XwVUr/+9b1xSOYj6L6sqq6TRB0bFp74ONclUDC MpWQLzOOicky4qXEAo8RIqPouC0bttEjrUdLsAnT35V9M5S66JedTFC62jVVJ04hhUE2 ZQyMsu5C8c9R+INxXdTB+5VCcLo2Ms3mwy0YgsFy6gOKEBEJBb3moGUoDiWf8C0huXzK 3AaQ== X-Gm-Message-State: AFeK/H13j6iIToz6QkoAbbadRaTN5MB9IANOhjCCYzOu+cf2Q/NLH0tRvr95Je7cKLStqe5ZnNG5uKezT4YuGA== X-Received: by 10.223.160.17 with SMTP id k17mr27535973wrk.106.1490113514090; Tue, 21 Mar 2017 09:25:14 -0700 (PDT) MIME-Version: 1.0 Received: by 10.80.146.132 with HTTP; Tue, 21 Mar 2017 09:25:13 -0700 (PDT) In-Reply-To: <2F7D5F42-E50A-4761-9EEC-DC873BD7D0AB@obsigna.com> References: <1489864043.40576.219.camel@freebsd.org> <16B03E70-00E6-4C17-9A9A-8601F4C07364@obsigna.com> <2F7D5F42-E50A-4761-9EEC-DC873BD7D0AB@obsigna.com> From: Luiz Otavio O Souza Date: Tue, 21 Mar 2017 13:25:13 -0300 Message-ID: Subject: Re: Identifying counterfeit microSD cards on a Beaglebone Black To: "Dr. Rolf Jansen" Cc: "freebsd-arm@freebsd.org" Content-Type: text/plain; charset=UTF-8 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: Tue, 21 Mar 2017 16:25:17 -0000 On 19 March 2017 at 18:45, Dr. Rolf Jansen wrote: > Am 18.03.2017 um 21:30 schrieb Dr. Rolf Jansen: >> Am 18.03.2017 um 16:07 schrieb Ian Lepore: >>> On Sat, 2017-03-18 at 15:03 -0300, Dr. Rolf Jansen wrote: >>>> Am 18.03.2017 um 12:30 schrieb Warner Losh: >>>>> >>>>> On Sat, Mar 18, 2017 at 8:44 AM, Dr. Rolf Jansen >>>>> wrote: >>>>>> >>>>>> I bought a 16 GB microSDHC SanDisk chip rated at 4 MB/s write >>>>>> speed for use with my Beaglebone Black. >>>>>> >>>>>> 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. [picking a random message to reply] I just saw an email from SanDisk support (whatever this means) where they claim the only supported model for this kind of use is the high-endurance series: https://www.sandisk.com/home/memory-cards/microsd-cards/high-endurance-microsd This same email says that running any kind of OS in any of the other card models automatically breaks the warranty. HTH, Luiz