Date: Sun, 24 Feb 2019 12:17:13 -0700 From: "@lbutlr" <kremels@kreme.com> To: info--- via freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: Recover failed SD card Message-ID: <3BA6830C-BFA0-47C3-A77D-22DFA581045C@kreme.com> In-Reply-To: <16fe9803-9978-df84-7534-d46803e8e08d@kicp.uchicago.edu> References: <2341a9ac-42aa-737e-441f-b69cccc826c6@netfence.it> <d5a35ea2-4730-1244-7448-8effa8aca8d8@kicp.uchicago.edu> <afed71c6-b3be-9144-5bc1-78663932e6f5@baywinds.org> <1D49330E-F047-4F86-8F37-A54980624332@kreme.com> <16fe9803-9978-df84-7534-d46803e8e08d@kicp.uchicago.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
On 24 Feb 2019, at 07:34, Valeri Galtsev <galtsev@kicp.uchicago.edu> = wrote: > On 2/23/19 6:46 PM, @lbutlr wrote: >> On 23 Feb 2019, at 13:50, Bruce Ferrell <bferrell@baywinds.org> = 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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3BA6830C-BFA0-47C3-A77D-22DFA581045C>