Too big for 4GB card

[Joe Talbott]

On Thu, Feb 12, 2015 at 10:58:43PM -0200, Sergio Schvezov wrote:
> On jueves 12 de febrero de 2015 22h'25:51 BRST, Gustavo Niemeyer wrote:
> >Hey all,
> >
> >It would be good to reduce the snappy image size just a little bit.
> >I have a Kingston MicroSD card that self-reports as 4GB, but it
> >is not large enough to hold the image. I had to take a few MB
> >out from the last partition to make it work.
> 
> I totally agree! I just haven't figured out what a "bit" is; I guess
> I we can be on the safe side and say 4GB is going to 3.9GB (-100MB
> to be on the safe side given the plethora of devices).
> 
> Is that a good number?
> 
> Ogra, you gave me a long explanation on variation; is +/-100MB a
> good σ expected on the population of sdcards around?

It's my understanding that a lot of storage manufacturers use 1000 as
the number of bits per kilobyte rather than 1024.  I'd think -300MB would
suffice as that's roughly the difference between the two.

Joe