Disc spanning works well on CD media in many applications, but spanning on DVD media fails even when using "Roxio Easy Media Creator 9", the most capable burning software available (as of 2007 June 12). This lack of reliable DVD data disc spanning is odd, as disc spanning was used extensively on older 3.5" and 5.25" floppy discs. Most users assume every operating system can perform disc spanning on any media as a built in function; this is incorrect.
Some disc spanning schemes include a small program to reassemble the data set into the same structure it had on the source machine. This program could be written to the first disc only, or to every disc in the set.
The use of disc spanning will in most cases make your files unreadable to the file-system. Therefore you are bounded to use the same program later on to restore the data. Many users don't want to be bound to such solutions and use "Simple disc spanning" instead.
Simple disc spanning is a solution that groups the files into any media grouped based on size. There is one drawback with this system. Files that are bigger than the target media will not be burnt to the drive. It is simple but powerful and a simple calculation would be "How many CD/DVD/BD/HDDVD-s does this bunch of files need".
The simple grouping can be displayed like this
Disc1 -- (99%) [4,479MiB]
Disc2 -- (98%) [4,468MiB]
Disc3 -- (45%) [2,130MiB]
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