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a - archive
m5 - compression level, 0= lowest compression...1...2...3...4...5= max compression
-v5M split the output file in 5 megabytes archives, change to 700 for a CD, or 4200 for a DVD
R recursive for directories, do not use it for files
It's better to have the output of a compression already split than use the 'split' command after compression, would consume the double amount of disk space. Found at http://www.ubuntu-unleashed.com/2008/05/howto-create-split-rar-files-in-ubuntu.html