What is a .DS_Store file? What does a DS_Store file do?
.DS_Store files are used by Mac OS X to store folder specific metadata information. They are created in every folder that Mac OS X Finder accesses, even network volumes and external devices. Folder level customizations are stored in the DS_Store file, things like custom icons, icon placement, icon size, window placement, list views, custom background pictures or colors, etc.
What is a .DS_Store file? What does a DS_Store file do?
http://osxdaily.com/2009/12/31/what-is-a-ds_store-file/