Unlike Microsoft Windows, which represents drives as letters that precede pathnames (for example, C:\), BlackBerry 10 OS represents disk drives as regular directories within the pathname space. Directories that access another filesystem, such as one on a second hard disk partition, are called mountpoints.
For more information on where to find things in a typical BlackBerry 10 OS pathname space, see Where everything is stored. To learn more about mounting filesystems, see Working with Filesystems.