I was reading the post on all of the worries about flash, and
remembered an article that I read. If you buy high en flash products
they can tolerate as much as 1000x more writes before failure than the
cheapos.
Read this article about testing USB flash, and the differences, but, I
think it would apply equally to high end microSD cards.
http://www.zdnet.com/blog/storage/usb-drive-life-fact-or-fiction/849
One of the high end products, they could not even break, as they did
not have enough time even doing continuous writes 24 hours a day to
destroy it:
"Even better news: the premium Memorex drive did not break! FWIW they
predicted failure after 60,000,000,000 writes - they just didn’t have
time to do that many"
So, a lot of the worries go away if you make sure you get a good microSD card.
I have applications running on a TS-7300 booting from SD, over 2 years
without problems, where there is power loss at times, and it was not
the very high end, just a good brand name SD. I had another
application running the TS-7300, doing data logging on a train every
second for 4 months (obviously no fflush() after every write, a write
only occurred when the buffer was full), and it did not fail. The
other thing is that in case of failure, you just send out a new SD
card . . .
Don.
--
Dr. Donald W. Carr
Arrayán #21, Zapopan, Mexico
Work +52-333-836-4511 (direct)
Work +52-333-836-4500 ext 2930
Home +52-331-562-4370
Cell 331-269-3416
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