Processes increase the file size in the output data

[Carlos Leandro Cordeiro]

Hello everyone, I'm having a processing problem when I use any function in a raster. I have 3 raster that has around 120mb and when I mosaic these images the file goes to almost 30Gb. I do not know what happens, but the output gets huge and I can not process anymore.

I have 3 vegetation raster (from a small area of Brazil) and separate them transforming the type of vegetation I want in 1 and the remainder in 0. In Python

I make the mosaic. In Python

Multiply 1 per 100. Arcgis, because I do not know how to do in python

And I want to add it to other vegetation data for the whole of Brazil, to replace the old values with that of the small part of Brazil. Arcgis, because I do not know how to do in python

But as the data gets huge I can not do it.

Can anybody help me?

Thanks