Microsoft Knowledge Base Article 218461 contains the following summary:

The Chkdsk.exe, Autochk.exe, and Chkntfs.exe tools are enhanced in Windows 2000 to allow administrators more precise control over when a file system check is performed on a volume.

Note that a volume is defined as a partition containing a file system that can be addressed using a drive letter/volume mount point or a Globally Unique Identifier (GUID).