Date: Thu, 23 Mar 2017 00:42:44 -0300 From: Dr. Rolf Jansen <rj@obsigna.com> To: freebsd-arm@freebsd.org Subject: Re: Identifying counterfeit microSD cards on a Beaglebone Black Message-ID: <70C95FC9-4B0A-4DA4-9857-EFAF41522D1B@obsigna.com> In-Reply-To: <CAB=2f8wR57ip7gUVGQqHNAzCHq-qiC8nwVG1%2BASu1N3kCcKrEQ@mail.gmail.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> <CAB=2f8wR57ip7gUVGQqHNAzCHq-qiC8nwVG1%2BASu1N3kCcKrEQ@mail.gmail.com>
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Am 21.03.2017 um 13:25 schrieb Luiz Otavio O Souza <lists.br@gmail.com>: > 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: >>>>>>=20 >>>>>> On Sat, Mar 18, 2017 at 8:44 AM, Dr. Rolf Jansen >>>>>> wrote: >>>>>>>=20 >>>>>>> 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). >>>>>>>=20 >>>>>>> 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. >=20 > [picking a random message to reply] >=20 > 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-mic= rosd >=20 > This same email says that running any kind of OS in any of the other > card models automatically breaks the warranty. Luiz, thank you very much for the note. Do you know, whether this high = endurance XC card is compatible with the Beaglebone Black? Best regards Rolf=
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