rasPi Stretch Lite install notes

Gary E. Miller gem at rellim.com
Mon Jan 8 21:09:24 UTC 2018

Yo Achim!

On Mon, 08 Jan 2018 21:47:05 +0100
Achim Gratz via devel <devel at ntpsec.org> wrote:

> You might have better luck with somewhat less cheap cards, one of the
> big differences between SD cards is how well they do wear levelling.

Yup.  I see that, can't say it corelates so much to price as brand.

> Also, a bigger card with free space has more actual storage to level
> the wear on.

Yeah, I'm all 32GB for RasPi now.  I'll do 64GB when the price
comes down a tad more.

> Actually I think that the failed card might start working again when
> I just low-level format it

I've not been so lucky.  Better to give the card to 'friends'.  :-)

> I might contemplate a mini USB drive for the logs, but I'd like to
> keep things local.

I've never beat on a USB drive as much as I beat on an SD card.  Would
they really be better?  At least if the data is on its own device I
only lose the data.

> Unfortunately there is no way of knowing in
> advance how much current those frives pull

Easy, get a USB VA meter.  Good ones for $8.  You'll be amazed at all
the things it teachs you.  

I also have 1 Amp, 2 Amp, USB loads.  A lot of USB cables will not carry
much current.

> and I'd like to keep that
> as low as possible also.

I just tested a 16GB USB stick.  0.06A idle.  0.10A continuous reading.
0.10A continuous writing.

Then a 32GB SD card, in a USB adapter.  0.03A idle, 0.08 continuous
reading, and 0.09A continuous writing.  So not much difference.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588

	    Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin
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