This example creates two .MDXs containing identical data but with different IBLOCK settings and consequently, different file sizes:

close data
delete file Co1.mdx
delete file Co2.mdx
// remove any previous .mdx
// create the MDXs
use Company exclusive
set iblock to 2
index on CompCode tag CompCode of Co1
index on Company tag Company of Co1
index on City tag City of Co1
set iblock to 20
index on CompCode tag CompCode of Co2
index on Company tag Company of Co2
index on City tag City of Co2
dir co?.mdx

Two .MDXs, Co1.MDX and Co2.MDX are created with different IBLOCK settings. CO1 and CO2 will have different file sizes because their block lengths are different.