The drive list displays information about every drive and the action O&O Defrag is currently running on it. The columns of this list can be setup as you like. All you need to do is right-click the drive and click Change Columns.
The default display consists of the following: drive letter, status, progress of an action in percent, number of fragmented files, size of drive, amount of free space, file system, and the current file/folder.
O&O Defrag drive list