Date: Sat, 18 Mar 2017 11:44:28 -0300 From: "Dr. Rolf Jansen" <rj@obsigna.com> To: freebsd-arm@FreeBSD.org Subject: Identifying counterfeit microSD cards on a Beaglebone Black Message-ID: <D08E6528-56E6-4229-8722-D87116B8064D@obsigna.com>
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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).
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.
Also, it would be nice to see some speed values as a reference for =
microSDHC card write speeds on:
FreeBSD 12.0-CURRENT (BEAGLEBONE) #0 r315413
Many thanks in advance for any help.
Best regards
Rolf=
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