As data is written to the filegroup, the database engine writes an amount proportional to the free space in the file to each file within the filegroup, instead of writing all the data to the first file until full.
Kama data imeandikwa kwa filegroup, injini database anaandika kiasi sawia na nafasi ya bure katika faili ya kila file ndani ya filegroup, badala ya kuandika data zote na faili kwanza mpaka kamili.