CORTAPE specifies the type of media that should be used for the data distribution from the correlator. This must be FTP, DAT, DISK or NONE. FTP and NONE basically mean that the PI will pick up a disk copy of the data by means of a network copy (there is no effective difference between the two). EXABYTE was recently removed for lack of use, as 9TRACK was long ago. DAT will likely go soon. FLASH may get added some day, but not yet.