I downloaded some large mat. files from a SFTP-server to my home computer through Filezilla. The filesize of the files I downloaded to my computer was a little smaller than the filesize in the SFTP-server, but not that much difference F.eks was the filesize in the SFTP-server 1223022kb while after downloaded it was 1194358kb. When I loaded the files into matlab, it looks like the workspace contains all the arrays with the right number of rows and columns, so I expect that the file contains all the data. But I still wonder why the filesize is a little different. Someone have a good answer?