Sparse file under Linux
https://wiki.archlinux.org/index.php/Sparse_file
This article contains information regarding sparse files, their creation, maintenance, and expansion.
Contents
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* 1Sparse Files
* 1.1What is a sparse file?
* 1.2Advantages
* 1.3Disadvantages
* 2Creating sparse files
* 2.1Making existing files sparse
* 2.2Formatting the file with a filesystem
* 2.