On Fri, Apr 6, 2018 at 2:34 PM, Chris Green <c...@isbd.net> wrote:
> Robert Nelson <robertcnel...@gmail.com> wrote:
>> On Fri, Apr 6, 2018 at 1:17 PM, Chris Green <c...@isbd.net> wrote:
>> > Graham <gra...@flex-radio.com> wrote:
>> >>
>> >> From memory it was:
>> >>
>> >> Samsung 128GB up to 80MB/s EVO Class 10 Micro SDXC Card
>> >>
>> > Thanks, that gives me lots of 'headroom' when compared with what I'm
>> > actually likely to need/use.
>> fyi: You'll need to be careful with SDXC. The am335x mmc/sdio
>> controller IP is only 100% rated for SDHC (max 32GB). (It doesn't
>> support the new SDXC voltages or all the new speeds...)
>> So stick with name brand "SDXC" microSD cards and test "1" before you buy 
>> many.
>> Likewise here, Samsung/Sandisk SDXC's seem to work fine.. ;)
> Thanks Robert, I don't even need anything like 32Gb, my 4Gb eMMC based
> BBB (running Debian 7) is only half full still.  Debian 9 won't need
> much more space so I can still fit happily in 4Gb.
> My question was more to find out what microSD cards I could use for
> installing the new OS.
> Plus I have two older BBBs with only 2Gb which is decidedly tight so
> using a microSD card instead would provide more space so I can use
> them as backup systems.  Is there any difference in speed between eMMC
> and microSD (though presumably SD cards vary in speed)?

Well the eMMC has a 8 bit interface (1), where as the microSD only has
an 4 bit interface (2)...  However even generic microSD's can be
faster then the eMMC..  (kinda of a waste of the 8bit interface..)




Robert Nelson

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