/scratch/
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Used for temporary or easily recoverable data should the data be lost.
/scratch would usually be a separate partition on a separate, fast disk where reliability if of a lesser concern but performance a boon.
Files and applications to be considered for /scratch:
- distribution packaging (e.g. Gentoo's portage tree).
- off-tree compile directory (the build/ directory in software source tree).
- blender 3D bake files.
- new/ and tmp/ directory in a mailbox directory, as opposed to the cur/ directory which permanently stores the emails.
- per user scratch directories in /scratch/users/ with a symlink from /home/$user/scratch => /scratch/users/$user/.
- video editing.
- /tmp/ => /scratch/tmp/.
- cache files of any application, e.g. within ~/.mozilla/cache.
http://linux.overshoot.tv/blogs/augustin/provide_optimized_partitioning_...
https://en.wikipedia.org/wiki/Scratch_space