Too big for 4GB card

[Sergio Schvezov]

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?