Blackboard Drive is available only if your institution licenses content management.
Blackboard Drive is a client desktop application for Windows and Mac OS X that allows desktop access to the Content Collection by mapping it as a shared network drive (a lettered drive).
Blackboard Drive uses the WebDAV protocol for communication with content management, but it has many advantages over the OS native WebDAV clients such as Microsoft Web Folders and the Mac OS X WebDAV client. Blackboard Drive provides better reliability, a more consistent experience, and improved user efficiency.
To see the Release Notes for your particular release, see the related support bulletin or the download page.