* Henry Baker <hbaker1@pipeline.com> [Feb 16. 2015 08:57]:
I'm using the Linux "disk utility" benchmark function.
I've done some more benchmarking on a variety of flash SD cards and USB flash drives.
I'm seeing various kinds of performance.
I tried a 16GB Sandisk "Ultra", which has excellent read rates (35 MB/s)
Not bad, but "excellent" would be 100 MB/s.
and lousy write rates (3.4 MB/s avg).
Yes, lousy (here "excellent" would be 90 MB/s). (specs from MicroSDHC-Card 16GB - SanDisk Extreme Pro )
[...]
On Sun, Feb 15, 2015 at 7:19 AM, Henry Baker <hbaker1@pipeline.com> wrote:
I purchased 4 32GB uSD cards from Costco yesterday, and found to my amazement
Warning about buying this kind of things in a supermarket: they tend to offer low-grade electronics, sometimes with specs so bad you can't get anywhere else. If have been bitten by this. Find a good electronics shop, ask people who buy hardware on a regular basis to recommend such a shop (this may well be an internet-only business).
[...]
Now I'm going to have to test all of my SD cards in advance prior to using them.
Using _any_ storage (incl. RAM) without thorough prior testing is a bad (though common) mistake.
[...]
Best regards, jj