This parameter specifies the copy command to be used to copy files to local disks.
disk_copy_cmd = copy|dd|ocopy|rman|copy_gnu| dd_gnu|rman_gnu|rman_set|rman_set_gnu
Default value: copy
Possible values:
copy: cp (UNIX) or copy (Windows) command copies data to disk
dd: dd command copies data to disk.
ocopy: Oracle OCOPY tool copies data to a local disk - available only on Windows systems
rman: Oracle Recovery Manager (RMAN) copies data to disk (for one-to-one copies of data files). See RMAN Backup with an External Backup Library.
rman_set: Oracle RMAN creates save sets for data files on disk. This enables the use of RMAN compress for disk backups. For more information, see . rman_compress.
The suffix _gnu lets you use the GNU tools to copy files. GNU cpio in particular is used to copy directories to disk