From owner-freebsd-questions@freebsd.org Sun Feb 24 19:17:22 2019 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 7FDE3150828E for ; Sun, 24 Feb 2019 19:17:22 +0000 (UTC) (envelope-from kremels@kreme.com) Received: from mail.covisp.net (mail.covisp.net [65.121.55.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id A399182D78 for ; Sun, 24 Feb 2019 19:17:21 +0000 (UTC) (envelope-from kremels@kreme.com) Subject: Re: Recover failed SD card Content-Type: text/plain; charset=utf-8 From: "@lbutlr" In-Reply-To: <16fe9803-9978-df84-7534-d46803e8e08d@kicp.uchicago.edu> Date: Sun, 24 Feb 2019 12:17:13 -0700 X-Random-Signature: Apple Broke Applescrip[t access to signatures, random sigs now powered by Keyboard Maestro Pro X-Face: )^b5"R:T7U>9~:PEn3YkzMfW*[b1qKeU.fP9C8~8HpU9}lA&6`bH1 Message-Id: <3BA6830C-BFA0-47C3-A77D-22DFA581045C@kreme.com> Content-Transfer-Encoding: quoted-printable References: <2341a9ac-42aa-737e-441f-b69cccc826c6@netfence.it> <1D49330E-F047-4F86-8F37-A54980624332@kreme.com> <16fe9803-9978-df84-7534-d46803e8e08d@kicp.uchicago.edu> To: info--- via freebsd-questions X-Mailer: Apple Mail (2.3445.102.3) X-Rspamd-Queue-Id: A399182D78 X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; spf=pass (mx1.freebsd.org: domain of kremels@kreme.com designates 65.121.55.42 as permitted sender) smtp.mailfrom=kremels@kreme.com X-Spamd-Result: default: False [0.70 / 15.00]; ARC_NA(0.00)[]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+mx]; MISSING_MIME_VERSION(2.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DMARC_NA(0.00)[kreme.com]; NEURAL_SPAM_MEDIUM(0.49)[0.492,0]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-0.83)[-0.828,0]; IP_SCORE(-0.02)[asn: 209(-0.02), country: US(-0.07)]; TO_DN_ALL(0.00)[]; MX_GOOD(-0.01)[mail.covisp.net]; NEURAL_HAM_SHORT(-0.54)[-0.537,0]; RCVD_COUNT_ZERO(0.00)[0]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:209, ipnet:65.112.0.0/12, country:US]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCVD_IN_DNSWL_LOW(-0.10)[42.55.121.65.list.dnswl.org : 127.0.5.1] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 24 Feb 2019 19:17:22 -0000 On 24 Feb 2019, at 07:34, Valeri Galtsev = wrote: > On 2/23/19 6:46 PM, @lbutlr wrote: >> On 23 Feb 2019, at 13:50, Bruce Ferrell = wrote: >>> Unfortunately flash memory "wears out". There are spare storage = blocks and logic to level wear by switching th the spares when main = block failures are detected. >> Yeah, that=E2=80=99s good theory, but it=E2=80=99s not what has = happened with mine. Genrally they fail in the first few weeks. Even if = it takes longer, it is not like they have been written and rewritten = many times. This isn=E2=80=99t a wear issue, it is an "SD Cards Break = easily" issue. >=20 > With all statements like that I would really like to hear at least the = following about failed devices: >=20 > 1. brand and model of device that failed on you Various brands. The most recent were SanDisk and Samsung. > 2. the source (vendor) you got the device from Microcenter or Amazon. > 1. High grade Samsung 128GB 100MB/s (U3) MicroSD EVO Select; The Samsung that failed after about six months (written to once, read = maybe 100 times) was a 32GB EVOplus 80MB/s 20MB/s microSD. I don=E2=80=99t= have the SanDisk one anymore, but it was also a 32GB with similar = specs. Both decided one day they were 32MB storage devices. The SanDisk = at least had the decency to do it when it was being formatted. > 2. This one I do not consider the best, but it survived at least 6 = years of use in car camera: Micro Center class 10 Micro SD (32 GB) I tend not to buy store brands, but I think SanDisk makes the cards for = Microcenter=E2=80=99s house brand. > So, instead of generalizing, I would really like to hear the detailed = information about _failed_ devises Too many for me to have kept close track of. They generally fail faster = than I expect, but some seem to last forever. When one fails I normally = try a bit to recover it, then bin it and pull out another one. --=20 Well I've seen the Heart of Darkness/Read the writing on the wall/and = the voice out in the desert/Was the voice out in the hall