e938ed2d_SharePoint_Server__2007__2010___SharePoint_Farm_Solution
[0] Physical Files Location [Sandboxed Solution] The Sandboxed solutions are stored in the content db of the site collection. No content goes in the file system. [Apps for SharePoint] The components for an app resides in multiple places: Externally: Remote components are persisted in databases, servers, or cloud-based services, that are external to the SharePoint farm. In SharePoint: SharePoint components, such as list templates, modules, workflows, site pages, Web Parts, and custom content types, are persisted within the SharePoint content database. [SharePoint Farm Solution] 
The content of a farm solution goes into the config DB and on the file system depending on the solution content.
A Point For Sharing On SharePoint Server (2007, 2010)
SharePoint Farm Solution