This is the name of the current disk.

A disk that is locked in software shows an unfilled lock symbol.
A disk that is locked in hardware shows a filled lock symbol.

To get information about the current disk, click this button.

Pressing the 'I' key is a shortcut.

To switch to the next available disk, click this button.

Pressing either the 'D' key or <TAB> is a shortcut.

To eject the current disk, click this button.

Pressing the 'E' key is a shortcut.

To unlock the disk, click this button.

Pressing the 'U' key is a shortcut.

To lock the disk with the entered password, click this button.

Pressing the 'L' key is a shortcut.