Identifying counterfeit microSD cards on a Beaglebone Black

[Dr. Rolf Jansen]

Am 21.03.2017 um 13:25 schrieb Luiz Otavio O Souza <lists.br at 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:
>>>>>> 
>>>>>> 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.

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