On 04/30/2015 09:08 AM, Dave Ihnat wrote:
On Wed, Apr 29, 2015 at 10:46:38PM -0400, Robert Moskowitz wrote:
I have a Microcomputer center a couple miles away, and they have mSD
cards by the dozens at the checkout counters. Each comes with the
SD adapter. I think I just spent $9 each for a few more 16Gb cards
for my testing.
I've been using the EMTec cards carried by MicroCenter. I don't trust
no-name or store-branded cards. There are just too many fraudulent cards
out there. I've considered using MicroCenter's, just because I can go back
to the store if there are problems, but the difference in price hasn't been
worth it.
That is why I blow away their partitions and do my own, even if I want a
DOS partition. I once, REALLY, got a USB stick from ecost.com that had
this strange hidden partition on it with this interesting code that had
an IP address imbedded in it.
Also, another thing you should consider is that there are speed classes of SD
cards from 3-10. You want Class 10--10MB/s. You'll often see Class 2,4,
and 6 cards at great prices--there's a reason.
I am looking at the card I got last week and it says C10.
I hate to recommend a Microsoft-based solution--try running it under
wine or something, if it offends the sensibilities--but look for, get
and run a little ditty called h2testw.exe (best site would be the source,
http://www.heise.de/download/h2testw.html--it's a German author and site,
but you can figure it out.) There are Linux alternatives--the one that
comes to mind is F3:
http://oss.digirati.com.br/f3/
Others, and some discussion of the problem:
https://www.raymond.cc/blog/test-and-detect-fake-or-counterfeit-usb-flash-drives-bought-from-ebay-with-h2testw/
Some think that a RPi OS running off a SD card should be "tuned"; others
dismiss this, as the card specs give a large number of R/W ops before MTBF.
Nevertheless, especially if you're going to run 24x7, some things just
make sense:
o Turn on noatime in fstab
o Use tmpfs in fstab
o Use a bigger card--not for storage space, but wear leveling.
The latest uboot for F22 (and kernel) can just have uboot on the SD card
and then switch to your sata for everything else. That is the nice
thing about Cubies (and Wands and a few others). Real sata port. Hans
is working on USB drive support out of uboot, but I have not heard if he
has that working yet. There are a few things that won't made F22 and we
will have to wait for F23 for them.
As far as size--Raspbian comes as a 2GB image, which you expand to use the
capacity of the card. If you'r not going to do a lot of local data
storage, 8GB will work well (and be a lot cheaper). 16GB is a nice
compromise on cost/capacity (and wear leveling, if you believe in that as
an issue). 32GB is pricy, and if you're thinking about that much storage
maybe you want to hang a USB HDD or even SDD off the box; after all, we now
have four USB ports with the Pi 2.
Better to go with a smallish SD and put on a USB drive for your root and
such.
--
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