Many a times, we have to deal files that are larger than a flash drive, or of a CD or, DVD. Splitting files is one of 7zip's features. To split a file, right-click on a large file in 7 zip and click on Split Files. Choose one of the presets available or type in the size of the pieces in bytes. To add the files back together, select the first file of the sequence and click on File > Combine files.