A variable-length array of bytes, in which the number of bytes is specified in the Length field. The content of this field is based on the value of the FsInformationClass field in the Server Drive Query Directory Request message, which determines the different structures that can be contained in the Buffer field. For a complete list of these structures, refer to [MS-FSCC] section 2.4. The "File information class" table defines all the possible values for the FsInformationClass field.