Date: Tue, 21 Mar 2017 13:25:13 -0300 From: Luiz Otavio O Souza <lists.br@gmail.com> To: "Dr. Rolf Jansen" <rj@obsigna.com> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: Identifying counterfeit microSD cards on a Beaglebone Black Message-ID: <CAB=2f8wR57ip7gUVGQqHNAzCHq-qiC8nwVG1%2BASu1N3kCcKrEQ@mail.gmail.com> In-Reply-To: <2F7D5F42-E50A-4761-9EEC-DC873BD7D0AB@obsigna.com> References: <D08E6528-56E6-4229-8722-D87116B8064D@obsigna.com> <CANCZdfo97-iFg4zLxbyQhv9rPrd8eU5rN-mzDL5wz3xj6XxrsQ@mail.gmail.com> <A633D336-2581-4C51-A3C9-7AFD0ABB9E9F@obsigna.com> <1489864043.40576.219.camel@freebsd.org> <16B03E70-00E6-4C17-9A9A-8601F4C07364@obsigna.com> <2F7D5F42-E50A-4761-9EEC-DC873BD7D0AB@obsigna.com>
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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, Luizhome | help
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